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Summary of Significant Accounting Policies - Schedule of Components of Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Other Intangible Assets |  |
Amortization period of intangible assets | 6 years 2 months 12 days |
Initial Cost | $ 1,066.1 | $ 1,085.4
Net of Accumulated Amortization | 380.2 | 459.3
Capitalized Contract Costs |  |
Other Intangible Assets |  |
Initial Cost | 469.7 | 524.4
Net of Accumulated Amortization | 166.4 | 252.8
Acquired Contracts |  |
Other Intangible Assets |  |
Initial Cost | 66.6 | 87.4
Net of Accumulated Amortization | 0.3 | 3.0
Internal Use Software |  |
Other Intangible Assets |  |
Initial Cost | 443.6 | 387.8
Net of Accumulated Amortization | 166.0 | 155.3
Acquired Trademarks |  |
Other Intangible Assets |  |
Initial Cost | 30.1 | 30.2
Net of Accumulated Amortization | 8.4 | 9.6
Other Intangibles |  |
Other Intangible Assets |  |
Initial Cost | 17.4 | 17.0
Net of Accumulated Amortization | 0.4 |
Projects in Process |  |
Other Intangible Assets |  |
Initial Cost | 38.7 | 38.6
Net of Accumulated Amortization | $ 38.7 | $ 38.6
Weighted Average | Capitalized Contract Costs |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 5 years 10 months 24 days |
Weighted Average | Acquired Contracts |  |
Other Intangible Assets |  |
Amortization period of intangible assets | 11 years 9 months 18 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 4 months 24 days |

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 928 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483147/928-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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