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Leases (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 59.8 $ 54.1
Operating cash flows from finance leases 0.2 0.4
Financing cash flows from finance leases 2.6 3.8
Leased assets obtained in exchange for lease obligations:    
Operating leases 50.6 30.8
Finance leases $ 0.9 $ 0.9