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Leases (Lease Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease cost $ 28.3 $ 29.6  
Sublease income (1.2) (1.7)  
Lease, Cost $ 27.1 $ 27.9 $ 33.0