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Leases (Schedule of Lease Costs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Operating lease cost $ 11.9 $ 12.0
Variable lease cost 0.9 0.8
Sublease income (1.1) (1.0)
Total lease costs $ 11.7 $ 11.8