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Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Defined Benefit Retirement Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Amounts unrelated to service costs, expense (credit) | $ 0.2 | $ (0.5) |
Defined Benefit Retirement Plans | U.S. |  |  |
Amounts recognized on the balance sheet: |  |  |
Employer contribution to defined benefit retirement plans | 0.2 | 0.1 |
Expected employer contribution in full current year | 3.4 |  |
Net amortization gain deferral | $ (0.2) | $ (0.1) |
Defined Benefit Plan, Tax Status [Extensible List] | Non-qualified | Non-qualified | Non-qualified
Defined Benefit Retirement Plans | European |  |  |
Amounts recognized on the balance sheet: |  |  |
Employer contribution to defined benefit retirement plans | $ 1.1 | $ 1.0 |
Expected employer contribution in full current year | 5.6 |  |
Net amortization gain deferral | (0.3) | (0.1) |
Postretirement Health Care and Life Insurance Benefit Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Expected employer contribution in full current year | 0.4 |  |
Net amortization gain deferral | $ 0.2 | $ 0.2 |

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