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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 |

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