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Operating Leases (Rent Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense $ 158.2 $ 155.3 $ 152.8
Leased Facilities and Equipment      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense 110.7 109.5 110.1
Leased Vehicles      
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense $ 47.5 $ 45.8 $ 42.7