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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | $ (0.9) | $ (0.5) | $ (8.7) |  | $ (3.9) |
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] | (0.4) | (0.4) | (0.8) |  | (1.2) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | 0.0 | 0.0 | (0.1) | [1] | 0.0 | [1]
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | [1] | (0.9) | (1.2) | (10.5) |  | (5.3) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (1.3) | (1.6) | (11.4) |  | (6.5) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | (0.4) | (0.8) | (2.7) |  | (2.0) |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (0.9) | (0.8) | (8.7) |  | (4.5) |
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 | (0.1) | 0.0 |  | (0.1) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | [1] | 0.0 | 0.5 | 0.0 |  | 0.9 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 0.0 | 0.4 | 0.0 |  | 0.8 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 0.0 | 0.1 | 0.0 |  | 0.2 |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ 0.0 | $ 0.3 | $ 0.0 |  | $ 0.6 |
[1] | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

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