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Divestitures (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
Divestitures (Narrative) (Details) - USD ($) $ in Millions	Jul. 31, 2017	Feb. 01, 2017	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Asset impairments				$ 87.0	$ 95.0	$ 0.0
Impairment of goodwill					25.0
Decrease in noncontrolling interest as a result of divestiture					33.0
Disposal Group, Held-for-sale, Not Discontinued Operations \| Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Asset impairments			$ 95.0
Impairment of intangible assets			42.0
Impairment of goodwill			25.0
Impairment of held for use assets			28.0
Pre-tax (loss) gain on sale of businesses			(12.0)
Decrease in noncontrolling interest as a result of divestiture			90.0
Increase to additional paid in capital from as a result of divestitures			$ 57.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Capco Consulting Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Ownership percentage (percent)	40.00%
Pre-tax (loss) gain on sale of businesses	$ (41.0)
Proceeds from sale of businesses	$ 469.0
Ownership percentage by non-controlling interest	60.00%
Preferred unit dividend rate	12.00%
Pre-tax earnings						14.0
Equity method investments	$ 172.0			$ 142.0	$ 151.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PS&E
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of businesses		$ 500.0
Pre-tax earnings						$ 3.0
Consideration received		850.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PS&E \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Pre-tax (loss) gain on sale of businesses		$ 85.0
Cardinal Member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Ownership percentage (percent)				37.00%	38.00%
Banco Bradesco \| Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Ownership percentage (percent)				100.00%