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Postretirement Benefits Other than Pensions - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unrecognized actuarial losses | $ 3.0 | $ 3.1 |
Unrecognized actuarial losses, net of tax | 2.0 | 2.2 |
Unrecognized prior service credit | 9.2 | 9.8 |
Unrecognized prior service credit, net of tax | 6.4 | 7.0 |
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net gain (loss) recognized in other comprehensive income | 0.1 | (0.2) | $ 0.1
Amortization of net loss | 0.2 | 0.2 | 0.3
Amortization of prior service credit recognized in other comprehensive income | $ 0.6 | $ 1.3 | $ 1.3

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