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Postretirement Benefits Pretax Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Prior Service Costs (Credits) [Abstract] |  |  |  |
Amount Recognized as Component of Net Benefit Costs | [1] | $ (0.2) | $ (0.7) | $ (0.7)
Net Actuarial Losses [Abstract] |  |  |  |
Amount Recognized as Component of Net Benefit Costs | [1] | $ 1.1 | 1.1 | 6.2
Percentage of Benefit Obligation or Market Value of Assets, Over Which Actuarial Gains and Losses are Subject to Amortization (in Hundredths) |  | 10.00% |  |
Pension Plans [Member] |  |  |  |
Prior Service Costs (Credits) [Abstract] |  |  |  |
Beginning Balance |  | $ 0.0 | 0.0 |
Amount Recognized as Component of Net Benefit Costs |  | 0.0 | 0.0 |
Ending Balance |  | 0.0 | 0.0 | 0.0
Net Actuarial Losses [Abstract] |  |  |  |
Beginning Balance |  | 13.5 | 12.0 |
Actuarial (Gains) Losses Arising During the Period |  | 0.0 | 2.1 |
Amount Recognized as Component of Net Benefit Costs |  | (0.8) | (0.6) |
Ending Balance |  | 12.7 | 13.5 | 12.0
Total |  | 12.7 | 13.5 |
Other Postretirement Benefit Plans [Member] |  |  |  |
Prior Service Costs (Credits) [Abstract] |  |  |  |
Beginning Balance |  | (7.4) | (8.1) |
Amount Recognized as Component of Net Benefit Costs |  | 0.0 | 0.7 |
Ending Balance |  | (7.4) | (7.4) | (8.1)
Net Actuarial Losses [Abstract] |  |  |  |
Beginning Balance |  | 0.4 | (1.4) |
Actuarial (Gains) Losses Arising During the Period |  | (2.3) | 1.8 |
Amount Recognized as Component of Net Benefit Costs |  | 0.0 | 0.0 |
Ending Balance |  | (1.9) | 0.4 | $ (1.4)
Total |  | $ (9.3) | $ (7.0) |
[1] | (A) These Accumulated other comprehensive loss components are included in the computation of net pension and other benefit costs. See Note 17 – Postretirement Benefits for additional details.

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