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Leases - Lease Cash Flow and Supplemental Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 12.6 $ 12.5
Right-of-use assets obtained in exchange for new operating lease liabilities $ 6.1 $ 9.1