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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ (8.9) $ (10.1)
Supplemental non-cash information on lease liabilities arising from obtaining right-of-use assets:    
Right-of-use assets obtained in exchange for new operating lease liabilities $ 2.7 $ 0.9