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Leases (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 54.1 $ 51.9
Operating cash flows from finance leases 0.4 0.6
Financing cash flows from finance leases 3.8 5.3
Leased assets obtained in exchange for lease obligations:    
Operating leases 30.8 34.8
Finance leases $ 0.9 $ 1.5