Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefit Programs - Fair Value Measurement (Details)

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Pension and Other Postretirement Benefit Programs - Fair Value Measurement (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets $ 363.2 $ 0.0
U.S. Defined Benefit Pension Plans | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
U.S. Defined Benefit Pension Plans | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 363.2  
U.S. Defined Benefit Pension Plans | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
U.S. Defined Benefit Pension Plans | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 219.1  
U.S. Defined Benefit Pension Plans | Fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
U.S. Defined Benefit Pension Plans | Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 219.1  
U.S. Defined Benefit Pension Plans | Fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
U.S. Defined Benefit Pension Plans | Equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 144.1  
U.S. Defined Benefit Pension Plans | Equities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
U.S. Defined Benefit Pension Plans | Equities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 144.1  
U.S. Defined Benefit Pension Plans | Equities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 16.5 $ 0.0
Canadian Defined Benefit Pension Plans | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.5  
Canadian Defined Benefit Pension Plans | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 16.0  
Canadian Defined Benefit Pension Plans | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 8.1  
Canadian Defined Benefit Pension Plans | Fixed income securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Fixed income securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 8.1  
Canadian Defined Benefit Pension Plans | Fixed income securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Equities    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 7.9  
Canadian Defined Benefit Pension Plans | Equities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Equities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 7.9  
Canadian Defined Benefit Pension Plans | Equities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.5  
Canadian Defined Benefit Pension Plans | Other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.5  
Canadian Defined Benefit Pension Plans | Other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets 0.0  
Canadian Defined Benefit Pension Plans | Other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair Value of Plan Assets $ 0.0