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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Related Party Transactions
Other liabilities	$ 170.3			$ 170.3		$ 213.3
Non-controlling interests	847.1			847.1		932.0
Imputed interest expense and contingent payment arrangements	0.9		$ 0.3	(0.2)	$ (40.0)
Prior Owner | Private Equity Investment Partnerships of Affiliate
Related Party Transactions
Other liabilities	72.1			72.1		75.0
Non-controlling interests	3.3			3.3		5.1
Affiliated Entity
Related Party Transactions
Imputed interest expense and contingent payment arrangements					$ 44.7
Affiliated Entity | Imputed interest expense and contingent payment arrangements
Related Party Transactions
Imputed interest expense and contingent payment arrangements		$ 2.8
Affiliated Entity | Other Liabilities
Related Party Transactions
Contingent payment arrangements liability	$ 8.2			8.2		$ 10.2
Payments for contingent payment arrangements liabilities			$ 17.5	$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 25
-Paragraph 6
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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