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Significant Accounting Policies - Furniture, Equipment, Purchased Software, Leasehold Improvements and Software Development Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Software Development Costs |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life |  |  | 3 years |  |
Accumulated depreciation and amortization | $ 140.5 |  | $ 140.5 |  | $ 114.5
Amortization of pushdown accounting allocation |  |  | 9 years |  |
Amortization expense | 13.0 | $ 11.3 | $ 26.0 | $ 22.0 |
Software Development Costs | NFI Acquisition |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life of intangible assets |  |  | 1 year |  |
Minimum |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life of intangible assets |  |  | 7 years |  |
Maximum |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life of intangible assets |  |  | 13 years |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Accumulated depreciation and amortization | 63.9 |  | $ 63.9 |  | $ 56.0
Depreciation expense | $ 4.9 | $ 5.7 | $ 9.6 | $ 11.1 |
Furniture, Equipment, Purchased Software and Leasehold Improvements | Minimum |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life |  |  | 3 years |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements | Maximum |  |  |  |  |
Furniture, Equipment, Purchased Software and Leasehold Improvements |  |  |  |  |
Useful life |  |  | 7 years |  |

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