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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, 2021 | Dec. 31, 2020
Other Intangible Assets |  |
Amortization period of intangible assets | 8 years |
Initial Cost | $ 1,559.5 | $ 1,549.6
Net of Accumulated Amortization | 467.5 |
Net of Accumulated Amortization | 417.1 | 505.0
Capitalized Contract Costs |  |
Other Intangible Assets |  |
Initial Cost | 532.7 | 574.4
Net of Accumulated Amortization | 242.0 |
Net of Accumulated Amortization |  | 308.0
Acquired Contracts |  |
Other Intangible Assets |  |
Initial Cost | 552.9 | 561.7
Net of Accumulated Amortization | 50.2 |
Net of Accumulated Amortization |  | 75.8
Internal Use Software |  |
Other Intangible Assets |  |
Initial Cost | 388.7 | 310.3
Net of Accumulated Amortization | 128.8 |
Net of Accumulated Amortization |  | 55.5
Acquired Trademarks |  |
Other Intangible Assets |  |
Initial Cost | 30.1 | 30.1
Net of Accumulated Amortization | 10.8 |
Net of Accumulated Amortization |  | 12.0
Other Intangibles |  |
Other Intangible Assets |  |
Initial Cost | 19.4 | 19.4
Projects in Process |  |
Other Intangible Assets |  |
Initial Cost | 35.7 | 53.7
Net of Accumulated Amortization | $ 35.7 |
Net of Accumulated Amortization |  | $ 53.7
Weighted Average | Capitalized Contract Costs |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 6 years 2 months 12 days |
Weighted Average | Acquired Contracts |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 11 years 7 months 6 days |
Weighted Average | Internal Use Software |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 4 years 3 months 18 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 3 months 18 days |

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