Annual report pursuant to Section 13 and 15(d)

Pension And Other Postretirement Benefit Programs Summary of Balance Sheet Impact of Postretirement Benefit Plans, Related Benefit Obligations, Assets, Funded Status Rate Assumptions (Details)

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Pension And Other Postretirement Benefit Programs Summary of Balance Sheet Impact of Postretirement Benefit Plans, Related Benefit Obligations, Assets, Funded Status Rate Assumptions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Effect of curtailment $ (0.2) $ 0.0  
Fair value of plan assets as of end of period 337.1    
Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligations as of beginning of period 76.4 80.3  
Service cost 0.4 0.4 $ 0.1
Interest cost 2.6 3.2 2.6
Plan participants' contributions 1.6 1.7  
Actuarial (gain)/loss 9.0 (0.5)  
Benefits paid 9.6 9.7  
Benefit obligation as of end of period 62.2 76.4 80.3
Fair value of plan assets as of beginning of period 0.0 0.0  
Employer contribution 8.0 8.0  
Plan participants' contribution 1.6 1.7  
Benefits paid 9.6 9.7  
Fair value of plan assets as of end of period 0.0 0.0 $ 0.0
Funded status of the plans $ (62.2) $ (76.4)