Annual report pursuant to Section 13 and 15(d)

Pension And Other Postretirement Benefit Programs - Expected Future Benefit Payments (Details)

v3.10.0.1
Pension And Other Postretirement Benefit Programs - Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Retiree Health and Life Insurance Plans  
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2019 $ 6.5
2020 6.2
2021 6.0
2022 5.8
2023 5.4
2024-2028 21.4
U.S. Pension Plan | Retiree Health and Life Insurance Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions, next fiscal year 6.5
U.S. Pension Plan | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions, next fiscal year 0.1
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2019 16.8
2020 18.4
2021 18.7
2022 19.9
2023 20.6
2024-2028 113.6
Canadian Pension Plan | Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contributions, next fiscal year 0.1
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2019 1.3
2020 1.3
2021 1.2
2022 1.1
2023 1.1
2024-2028 $ 5.0