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Retirement Benefits Plans (Amounts Recognized as Components of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassifications to earnings of: |  |  |
Prior service benefit amortization | $ (0.1) | $ 0.0 | $ 0.1
Retirement benefit plan funded status adjustments: |  |  |
Actuarial (losses) gains | 1.6 | 0.7 | (0.6)
Total | (0.1) |  | 0.1
Postretirement benefit plans |  |  |
Reclassifications to earnings of: |  |  |
Actuarial loss amortization | 0.7 | 0.6 | 0.6
Prior service benefit amortization | (0.5) | (0.6) | (0.7)
Retirement benefit plan funded status adjustments: |  |  |
Actuarial (losses) gains | (2.0) | (1.0) | 0.8
Total | $ (1.8) | $ (1.0) | $ 0.7

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