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Property and Equipment - Fully Depreciated Assets and Assets Under Capital Lease (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Fully depreciated assets $ 311.7 $ 318.6
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Capital Leased Assets, Gross 351.0 342.9
Accumumlated Amortization (126.9) (104.6)
Assets Under Capital Lease Obligations, Net 224.1 238.3
Building [Member]    
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Capital Leased Assets, Gross 329.6 329.6
Vehicles [Member]    
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Capital Leased Assets, Gross 21.1 13.0
Equipment [Member]    
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Capital Leased Assets, Gross $ 0.3 $ 0.3