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Leases - Information Related to Fully Depreciated Assets and Assets Under Capital Lease Obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Lessor, Lease, Description [Line Items]  
Capital leased assets, gross $ 351.0
Less: Accumulated amortization (126.9)
Assets under capital lease obligations, net 224.1
Buildings  
Lessor, Lease, Description [Line Items]  
Capital leased assets, gross 329.6
Vehicles  
Lessor, Lease, Description [Line Items]  
Capital leased assets, gross 21.1
Equipment  
Lessor, Lease, Description [Line Items]  
Capital leased assets, gross $ 0.3