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Leases - Operating Lease Costs, and Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Leases [Abstract]          
Operating lease cost $ 12.3 $ 12.5 $ 25.2 $ 24.9 $ 49.7
Short-term and variable lease cost 5.6 8.3 13.1 14.1  
Total lease cost $ 17.9 $ 20.8 38.3 39.0 81.3
Cash paid for amounts included in the measurement of lease liabilities:          
Operating cash outflows - Payments on operating leases     25.2 24.7  
Right-of-use assets obtained in exchange for new lease obligations:          
Operating leases     $ 24.6 $ 126.5 $ 157.0