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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases $ (10.2) $ (10.6) $ (30.1) $ (31.2)
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 $ 3.5 $ 7.8 $ 6.4 $ 11.7