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Leases - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]            
Operating lease assets $ 1,389.0   $ 1,389.0   $ 1,200.0 $ 0.0
Short-term operating lease liabilities 161.7   161.7     0.0
Operating lease liabilities 1,221.3   1,221.3     $ 0.0
Variable lease costs $ 20.4   $ 39.9      
Weighted average remaining lease term 10 years 2 months 12 days   10 years 2 months 12 days      
Weighted average discount rate 6.20%   6.20%      
Cash paid for operating leases     $ 195.5      
Operating lease asset obtained in exchange for operating lease liability     252.5      
Lessor, Lease, Description [Line Items]            
Rental income $ 296.1 $ 271.2 $ 538.1 $ 503.1    
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 $ 102.6   $ 197.0      
Selling, general and administrative            
Lessee, Lease, Description [Line Items]            
Operating lease costs $ 2.3   $ 4.4