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Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,158.1 | $ 2,844.5
Accumulated Amortization | (2,530.0) | (2,399.4)
Net Carrying Amount | 1,628.1 | 445.1
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,330.9 | 2,131.5
Accumulated Amortization | (1,987.8) | (1,927.9)
Net Carrying Amount | 1,343.1 | $ 203.6
Trade name |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) |  | 20 years
Gross Carrying Amount | 472.7 | $ 422.8
Accumulated Amortization | (302.0) | (280.1)
Net Carrying Amount | 170.7 | 142.7
Internally developed software |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 352.0 | 280.6
Accumulated Amortization | (239.8) | (186.0)
Net Carrying Amount | 112.2 | 94.6
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2.5 | 9.6
Accumulated Amortization | (0.4) | (5.4)
Net Carrying Amount | $ 2.1 | $ 4.2
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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