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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Components of Property and Equipment    
Property and Equipment, Gross $ 2,453.6 $ 2,279.0
Property and Equipment, net 1,517.1 1,391.8
Land, Building, Improvements, Equipment and Furniture [Member]    
Components of Property and Equipment    
Less: Accumulated depreciation and amortization (1,097.8) (982.4)
Property and Equipment, net 1,355.8 1,296.6
Land [Member]    
Components of Property and Equipment    
Property and Equipment, Gross 125.4 125.3
Building [Member]    
Components of Property and Equipment    
Property and Equipment, Gross 1,712.4 1,601.4
Leasehold Improvements [Member]    
Components of Property and Equipment    
Property and Equipment, Gross 138.1 115.2
Vehicles [Member]    
Components of Property and Equipment    
Property and Equipment, Gross 16.2 11.8
Furniture and Fixtures [Member]    
Components of Property and Equipment    
Property and Equipment, Gross 461.5 425.3
Construction in Progress [Member]    
Components of Property and Equipment    
Property and Equipment, net $ 161.3 $ 95.2