Annual report pursuant to Section 13 and 15(d)

Pension And Other Postretirement Benefit Programs - Benefit Obligations in Excess of Assets (Details)

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Pension And Other Postretirement Benefit Programs - Benefit Obligations in Excess of Assets (Details) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
U.S. Pension Plan    
Defined-benefit pension plans with benefit obligations in excess of assets    
Projected benefit obligation, December 31 $ 394.6 $ 346.4
Accumulated benefit obligation, December 31 393.2 345.1
Fair value of plan assets, December 31 380.7 337.1
Canadian Pension Plan    
Defined-benefit pension plans with benefit obligations in excess of assets    
Projected benefit obligation, December 31 15.8 15.2
Accumulated benefit obligation, December 31 15.8 15.2
Fair value of plan assets, December 31 $ 13.7 $ 13.1