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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (16.1) | $ (27.9) | $ (24.8) | $ (32.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 0.3 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0.0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.6 | 0.2 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | (1.0) |  | (1.3)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 0.3 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (17.4) | (29.6) | (26.1) | (34.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0.0 | 0.0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.6 | 0.8 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | 1.3 | 2.7 | $ 1.3 | $ 3.3
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0.0 | 0.0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.0 | (0.6) |  |
Settlement Cost [Member] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 8.1 | 3.7 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0.0 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 8.1 | 3.7 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0.0 | $ 0.0 |  |

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