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Pensions and Other Postretirement Benefits Contributions to Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions to pension and other postretirement plans | $ 37.5 | $ 55.4
Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions to pension and other postretirement plans | 36.0 | 53.5
Other postretirement benefits, net of participant contributions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions to pension and other postretirement plans | 1.5 | 2.0
Qualified Plan | Pension Plan | UNITED STATES |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions to pension and other postretirement plans | 30.0 | 44.0
Nonqualified Plan | Pension Plan | UNITED STATES |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions to pension and other postretirement plans | $ 6.0 | $ 9.4

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