Annual report pursuant to Section 13 and 15(d)

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

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Pension and Other Postretirement Benefit Programs - Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Retiree Health and Life Insurance Plans  
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2018 $ 6.7
2019 6.5
2020 6.4
2021 6.3
2022 6.1
2023-2027 25.4
U.S. Pension Plan | Pension Plan  
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2018 15.8
2019 16.7
2020 17.7
2021 18.8
2022 19.9
2023-2027 113.0
Canadian Pension Plan | Pension Plan  
U.S. Pension Benefits, Canadian Pension Benefits, and Retiree Health and Life Insurance Benefits, Gross  
2018 1.5
2019 1.4
2020 1.4
2021 1.3
2022 1.3
2023-2027 $ 6.2