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Leases Cash Flow Information Related to Leases (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 9.9
Operating cash flows from finance leases 0.4
Financing cash flows from finance leases 3.3
Right-of-Use Assets Obtained in Exchange for Lease Obligations [Abstract]  
Operating leases 8.7
Finance leases $ 0.4