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Leases Cash Flow Information Related to Leases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 9.7 $ 29.3
Operating cash flows from finance leases 0.4 1.1
Financing cash flows from finance leases 3.0 9.3
Right-of-Use Assets Obtained in Exchange for Lease Obligations [Abstract]    
Operating leases 26.9 48.4
Finance leases $ 24.9 $ 27.3