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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill, Gross Carrying Value |  |  | $ 9,956.5 | $ 9,957.5
Goodwill, Accumulated Amortization |  |  | (518.1) | (517.0)
Goodwill, Net Carrying Value | $ 9,440.5 | $ 9,291.4 | 9,438.4 | 9,440.5
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 1,087.3 | 1,097.4
Intangible assets:, Accumulated Amortization |  |  | (781.1) | (759.2)
Intangible assets:, Net Carrying Value |  |  | 306.2 | 338.2
Changes in Goodwill |  |  |  |
Goodwill, January 1 | 9,440.5 | 9,384.3 |  |
Goodwill, Acquisitions | 46.1 | 8.9 |  |
Goodwill, Noncontrolling interests in acquired businesses | 32.4 | 17.2 |  |
Goodwill, Contingent purchase price obligations of acquired businesses | 0.0 | 24.7 |  |
Goodwill, Dispositions | (3.3) | (19.1) |  |
Goodwill, Foreign currency translation | (77.3) | (124.6) |  |
Goodwill, September 30 | $ 9,438.4 | $ 9,291.4 |  |
Purchased and internally developed software |  |  |  |
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 366.8 | 350.7
Intangible assets:, Accumulated Amortization |  |  | (299.0) | (288.5)
Intangible assets:, Net Carrying Value |  |  | 67.8 | 62.2
Customer related and other |  |  |  |
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 720.5 | 746.7
Intangible assets:, Accumulated Amortization |  |  | (482.1) | (470.7)
Intangible assets:, Net Carrying Value |  |  | $ 238.4 | $ 276.0

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