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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill, Gross Carrying Value |  |  | $ 9,871.8 | $ 9,481.4
Goodwill, Accumulated Amortization |  |  | (534.3) | (505.3)
Goodwill, Net Carrying Value | $ 8,976.1 | $ 8,676.4 | 9,337.5 | 8,976.1
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 1,248.3 | 1,205.0
Intangible assets:, Accumulated Amortization |  |  | (879.9) | (777.6)
Intangible assets:, Net Carrying Value |  |  | 368.4 | 427.4
Changes in Goodwill |  |  |  |
Goodwill, January 1 | 8,976.1 | 8,676.4 |  |
Goodwill, Acquisitions | 19.3 | 311.7 |  |
Goodwill, Noncontrolling interests in acquired businesses | 18.9 | 74.0 |  |
Goodwill, Contingent purchase price obligations of acquired businesses | 27.1 | 152.8 |  |
Goodwill, Foreign currency translation and other | 296.1 | (238.8) |  |
Goodwill, December 31 | 9,337.5 | 8,976.1 |  |
Goodwill, impairment losses | $ 0.0 | $ 0.0 |  |
Goodwill, accumulated impairment losses |  |  | 0.0 |
Purchased and internally developed software |  |  |  |
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 368.2 | 342.6
Intangible assets:, Accumulated Amortization |  |  | (303.0) | (270.2)
Intangible assets:, Net Carrying Value |  |  | 65.2 | 72.4
Customer related and other |  |  |  |
Intangible assets: |  |  |  |
Intangible assets:, Gross Carrying Value |  |  | 880.1 | 862.4
Intangible assets:, Accumulated Amortization |  |  | (576.9) | (507.4)
Intangible assets:, Net Carrying Value |  |  | $ 303.2 | $ 355.0

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