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Investments - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Apr. 30, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Document Period End Date						Sep. 30, 2019
Investments in unconsolidated affiliates	$ 851.9	$ 887.3	$ 904.5		$ 887.3	$ 851.9			$ 397.2
Equity in (losses) earnings of unconsolidated affiliates	$ (8.3)	$ (21.1)	$ (21.4)	$ 3.8	$ (42.5)	$ (50.8)	$ (16.9)
Ceridian
Schedule of Equity Method Investments [Line Items]
Ownership	20.00%					20.00%
Investments in unconsolidated affiliates	$ 370.3					$ 370.3			359.7
Equity in (losses) earnings of unconsolidated affiliates	$ 12.7			1.2		$ 16.7	(20.4)
Dun And Bradstreet Corporation
Schedule of Equity Method Investments [Line Items]
Ownership	24.30%					24.30%		24.30%
Investments in unconsolidated affiliates	$ 446.2					$ 446.2			0.0
Equity in (losses) earnings of unconsolidated affiliates	(21.4)			0.0		(68.6)	0.0
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	35.4					35.4			$ 37.5
Equity in (losses) earnings of unconsolidated affiliates	$ 0.4			$ 2.6		$ 1.1	$ 3.5

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