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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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Present value of lessee's discounted obligation for lease payments from finance lease.

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