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Summary of Significant Accounting Policies - Schedule of Components of Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Other Intangible Assets |  |
Amortization period of intangible assets | 6 years 3 months 18 days |
Initial Cost | $ 1,085.4 | $ 1,559.5
Net of Accumulated Amortization | 459.3 | 467.5
Capitalized Contract Costs |  |
Other Intangible Assets |  |
Initial Cost | 524.4 | 532.7
Net of Accumulated Amortization | 252.8 | 242.0
Acquired Contracts |  |
Other Intangible Assets |  |
Initial Cost | 87.4 | 552.9
Net of Accumulated Amortization | 3.0 | 50.2
Internal Use Software |  |
Other Intangible Assets |  |
Initial Cost | 387.8 | 388.7
Net of Accumulated Amortization | 155.3 | 128.8
Acquired Trademarks |  |
Other Intangible Assets |  |
Initial Cost | 30.2 | 30.1
Net of Accumulated Amortization | 9.6 | 10.8
Other Intangibles |  |
Other Intangible Assets |  |
Initial Cost | 17.0 | 19.4
Projects in Process |  |
Other Intangible Assets |  |
Initial Cost | 38.6 | 35.7
Net of Accumulated Amortization | $ 38.6 | $ 35.7
Weighted Average | Capitalized Contract Costs |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 5 years 9 months 18 days |
Weighted Average | Acquired Contracts |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 11 years 8 months 12 days |
Weighted Average | Internal Use Software |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 4 years 4 months 24 days |
Weighted Average | Acquired Trademarks |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 25 years 4 months 24 days |
Weighted Average | Other Intangibles |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 4 years 6 months |

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