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Postretirement Benefits Pretax Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Prior Service Costs (Credits) [Abstract] |  |  |  |
Amount Recognized as Component of Net Benefit Costs | [1] | $ (0.7) | $ (0.7) | $ (0.7)
Net Actuarial Losses [Abstract] |  |  |  |
Amount Recognized as Component of Net Benefit Costs | [1] | $ 6.2 | 10.3 | 15.2
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 |  | 298.3 | 302.1 |
Actuarial (Gains) Losses Arising During the Period |  | 12.3 | 6.1 |
Amount Recognized as Component of Net Benefit Costs |  | (298.6) | (9.9) |
Ending Balance |  | 12.0 | 298.3 | 302.1
Total |  | 12.0 | 298.3 |
Other Postretirement Benefit Plans [Member] |  |  |  |
Prior Service Costs (Credits) [Abstract] |  |  |  |
Beginning Balance |  | (8.8) | (9.5) |
Amount Recognized as Component of Net Benefit Costs |  | 0.7 | 0.7 |
Ending Balance |  | (8.1) | (8.8) | (9.5)
Net Actuarial Losses [Abstract] |  |  |  |
Beginning Balance |  | (1.5) | 1.0 |
Actuarial (Gains) Losses Arising During the Period |  | 0.1 | (2.5) |
Amount Recognized as Component of Net Benefit Costs |  | 0.0 | 0.0 |
Ending Balance |  | (1.4) | (1.5) | $ 1.0
Total |  | $ (9.5) | $ (10.3) |
[1] | (A) These Accumulated other comprehensive income (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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