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Leases (Supplemental Cash Flow Information) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 51.9
Operating cash flows from finance leases 0.6
Financing cash flows from finance leases 5.3
Leased assets obtained in exchange for lease obligations:  
Operating leases 34.8
Finance leases $ 1.5