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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases $ (8.7) $ (9.8) $ (17.6) $ (19.9)
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 $ 13.2 $ 2.0 $ 15.9 $ 2.9