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Leases - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]            
Operating lease assets $ 1,408.1   $ 1,408.1   $ 1,200.0 $ 0.0
Short-term operating lease liabilities 169.4   169.4     0.0
Operating lease liabilities 1,237.7   1,237.7     $ 0.0
Variable lease costs $ 26.3   $ 66.2      
Weighted average remaining lease term 10 years 2 months 12 days   10 years 2 months 12 days      
Weighted average discount rate 6.10%   6.10%      
Cash paid for operating leases     $ 296.5      
Operating lease asset obtained in exchange for operating lease liability     321.9      
Lessor, Lease, Description [Line Items]            
Rental income $ 301.3 $ 281.9 $ 839.4 $ 785.0    
Minimum            
Lessor, Lease, Description [Line Items]            
Customer lease term 28 days   28 days      
Maximum            
Lessor, Lease, Description [Line Items]            
Customer lease term 1 year   1 year      
Operating expense            
Lessee, Lease, Description [Line Items]            
Operating lease costs $ 103.5   $ 300.5      
Selling, general and administrative            
Lessee, Lease, Description [Line Items]            
Operating lease costs $ 2.5   $ 6.9