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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Related Party Transactions
Other liabilities	$ 179.7			$ 179.7		$ 213.3
Non-controlling interests	865.8			865.8		932.0
Imputed interest expense and contingent payment arrangements	(0.8)		$ 13.2	1.1	$ 40.4
Prior Owner | Private Equity Investment Partnerships of Affiliate
Related Party Transactions
Other liabilities	73.2			73.2		75.0
Non-controlling interests	4.0			4.0		5.1
Affiliated Entity
Related Party Transactions
Imputed interest expense and contingent payment arrangements			(15.0)		$ (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	$ 8.0			8.0		$ 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
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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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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