Property, Equipment and Software - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
|
| Property, Plant and Equipment [Line Items] | |||||
| Depreciation and amortization expense for property, equipment and software | $ 6.9 | $ 6.9 | $ 21.3 | $ 20.4 | |
| Carrying amount of capitalized software development costs | 89.0 | 89.0 | $ 73.4 | ||
| Accumulated depreciation of capitalized software development costs | (36.5) | (36.5) | $ (27.8) | ||
| Software | |||||
| Property, Plant and Equipment [Line Items] | |||||
| Depreciation and amortization expense for property, equipment and software | $ 3.2 | $ 2.2 | $ 8.7 | $ 5.7 | |
| X | ||||||||||
- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|