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Benefit Plans - Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Current liabilities | $ (2.4) | $ (2.3)
Noncurrent liabilities | (40.5) | (57.5)
Pension benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Noncurrent assets | 16.7 | 12.9
Current liabilities | (1.7) | (1.6)
Noncurrent liabilities | (35.6) | (52.1)
Total liabilities | (20.6) | (40.8)
Other retirement benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Noncurrent assets | 0.0 | 0.0
Current liabilities | (0.7) | (0.7)
Noncurrent liabilities | (4.9) | (5.4)
Total liabilities | $ (5.6) | $ (6.1)

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