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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) Reclassifications out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | $ (1.3) | $ (3.4) | $ (9.1) | $ (4.3)
Pension Plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] | (1.2) | (1.1) | (3.4) | (3.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | [1] | (1.1) | (4.2) | (10.5) | (4.2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (2.3) | (5.3) | (13.9) | (7.5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | (0.6) | (1.4) | (3.4) | (1.9)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (1.7) | (3.9) | (10.5) | (5.6)
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] | 0.0 | 0.0 | 0.1 | 0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | [1] | 0.6 | 0.6 | 1.7 | 1.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 0.6 | 0.6 | 1.8 | 1.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 0.2 | 0.1 | 0.4 | 0.4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ 0.4 | $ 0.5 | $ 1.4 | $ 1.3
[1] | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 12 for additional information).

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