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Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,305.0 | $ 4,230.8
Accumulated Amortization | (2,935.3) | (2,740.1)
Net Carrying Amount | 1,369.7 | 1,490.7
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,379.7 | 3,352.4
Accumulated Amortization | (2,236.6) | (2,100.6)
Net Carrying Amount | 1,143.1 | $ 1,251.8
Trade name |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) |  | 20 years
Gross Carrying Amount | 446.1 | $ 446.1
Accumulated Amortization | (366.6) | (341.0)
Net Carrying Amount | 79.5 | 105.1
Internally developed software |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 474.9 | 429.8
Accumulated Amortization | (330.6) | (297.6)
Net Carrying Amount | 144.3 | 132.2
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4.3 | 2.5
Accumulated Amortization | (1.5) | (0.9)
Net Carrying Amount | $ 2.8 | $ 1.6
Minimum | Customer relationships |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 3 years | 3 years
Minimum | Trade name |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 1 year | 1 year
Minimum | Internally developed software |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 3 years | 3 years
Minimum | Other |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 1 year | 1 year
Maximum | Customer relationships |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 14 years | 14 years
Maximum | Trade name |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 20 years |
Maximum | Internally developed software |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 5 years | 5 years
Maximum | Other |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 10 years | 10 years

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