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Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,803.0 | $ 2,702.6
Accumulated Amortization | (2,208.9) | (1,990.4)
Net Carrying Amount | 594.1 | 712.2
Customer relationships and contracts |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,111.2 | 2,071.0
Accumulated Amortization | (1,786.4) | (1,625.5)
Net Carrying Amount | $ 324.8 | $ 445.5
Trade name |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 20 years | 20 years
Gross Carrying Amount | $ 422.8 | $ 422.1
Accumulated Amortization | (259.0) | (237.3)
Net Carrying Amount | 163.8 | 184.8
Internally developed software |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 263.5 | 205.8
Accumulated Amortization | (160.0) | (125.4)
Net Carrying Amount | 103.5 | 80.4
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5.5 | 3.7
Accumulated Amortization | (3.5) | (2.2)
Net Carrying Amount | $ 2.0 | $ 1.5
Minimum | Customer relationships and contracts |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 3 years | 3 years
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 and contracts |  |
Intangible Assets [Line Items] |  |
Useful Life (Years) | 14 years | 14 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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