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Debt, Interest Income, Expense, and Other Finance Costs - Schedule of Debt (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Finance leases | $ 20.4 | $ 18.2
Total debt | 514.3 | 524.7
Less: Current maturities of long-term debt and finance leases | 30.1 | 22.9
Long-term debt | 484.2 | 501.8
Other |  |
Debt Instrument [Line Items] |  |
Long-term debt | 3.4 | 3.3
Term loans | Term loans |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 490.5 | $ 503.2

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