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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
 Lease Expense    
Operating, selling, general and administrative expenses $ 35.3 $ 40.1
Operating, asset impairments 2.0 1.4
Variable 2.8 2.3
Sublease income (1.3) (1.5)
Finance:    
Amortization of lease assets 6.3 5.5
Interest on lease liabilities 7.0 4.8
Net lease expense $ 52.1 $ 52.6