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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flow from operating leases $ 9.7 $ 9.7
Operating cash flows from finance leases 0.1 0.1
Financing cash flows from finance leases 1.3 1.2
Non-cash activities:    
Operating lease right-of-use assets obtained in exchange for new lease obligations 19.9 5.2
Finance lease right-of-use assets obtained in exchange for new lease obligations $ 1.2 $ 1.3