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Postretirement Benefits Other Than Pensions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) employees | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes | $ 6.1 | $ 80.5 | $ 45.5 | $ 67.0 | $ 44.2 | $ 68.3 | $ 52.1 | $ (3.5) | $ 199.1 | $ 161.1 | $ 3.5
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retired employees covered | employees |  |  |  |  |  |  |  |  | 700 |  |
Number of active employees covered | employees |  |  |  |  |  |  |  |  | 600 |  |
Plan Amendments |  |  |  |  |  |  |  |  |  |  | $ (11.0)
Effect of one percentage point increase on accumulated postretirement benefit obligation |  |  |  |  |  |  |  |  | $ 0.8 | $ 0.6 |
Amounts that will be amortized from AOCI in next Fiscal Year | 3.3 |  |  |  |  |  |  |  | 3.3 |  |
Estimated future employer contributions in next fiscal year | $ 1.7 |  |  |  |  |  |  |  | $ 1.7 |  |
Medical Benefits [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year | 7.50% |  |  |  | 7.50% |  |  |  | 7.50% | 7.50% |
Health care cost trend rate assumed for future years |  |  |  |  |  |  |  |  | 4.80% | 4.80% |
Prescription Drug Benefits [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year | 10.00% |  |  |  | 10.00% |  |  |  | 10.00% | 10.00% |
Health care cost trend rate assumed for future years |  |  |  |  |  |  |  |  | 4.80% | 4.80% |

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