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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]      
Gross rent expense $ 85.9 $ 71.0 $ 67.9
Sublease income 11.8 10.6 $ 4.5
Operating leases, future minimum payments no longer obligated to pay 192.4    
Property and equipment, gross 874.5 846.7  
Imputed financing obligation   27.4  
Operating lease, minimum obligation   831.6  
Tenant improvement reimbursements   75.0  
Letter of credit      
Loss Contingencies [Line Items]      
Letter of credit supporting obligations   34.2  
Accrued and other current liabilities      
Loss Contingencies [Line Items]      
Imputed financing obligation   2.6  
Other Noncurrent Liabilities      
Loss Contingencies [Line Items]      
Imputed financing obligation   24.8  
Building      
Loss Contingencies [Line Items]      
Property and equipment, gross $ 0.0 $ 36.6