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Employee Benefit Plans (Amounts Recognized in AOCI and Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes recognized in other comprehensive income (loss): |  |  |
Total recognized in other comprehensive income | $ (5.9) | $ (5.7) | $ (9.3)
Pension Benefits [Member] |  |  |
Amounts recognized in other comprehensive income (loss): |  |  |
Prior service costs | (0.7) | (0.8) |
Actuarial loss | (103.8) | (101.6) |
Subtotal | (104.5) | (102.4) |
Deferred taxes | 25.6 | 24.7 |
Net amount recognized | (78.9) | (77.7) |
Changes recognized in other comprehensive income (loss): |  |  |
Current year actuarial loss | 8.1 | (5.1) |
Effect of exchange rates | 0.5 | 0.5 |
Amortization of prior service (costs) credits | (0.2) | (0.1) |
Amortization of actuarial loss | (6.4) | (93.1) |
Total recognized in other comprehensive income | 2.0 | (97.8) |
Total recognized in net periodic benefit cost and other comprehensive income (loss) | 12.5 | $ 8.3 |
Estimated prior service (cost) credits | 0.2 |  |
Estimated actuarial gains (losses) | $ 6.9 |  |

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