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Leases (Schedule of Lease Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 12.2 $ 24.3
Variable lease cost 0.4 1.2
Sublease income (1.2) (2.2)
Total lease costs $ 11.4 $ 23.3