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Affiliate Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Affiliate Equity
Distributions paid to affiliate partners		$ 354.1	$ 431.4	$ 569.4
Payments to acquire interest in Affiliates		115.8	130.8	32.6
Issuance of interest in Affiliates		11.8	6.1	$ 11.0
Other Assets
Affiliate Equity
Due from Affiliates		22.9	22.6
Other Liabilities
Affiliate Equity
Due to Affiliates		$ 12.1	$ 62.3
Minimum
Affiliate Equity
Affiliate equity, conditional right to put interest, period	5 years
Maximum
Affiliate Equity
Affiliate equity, conditional right to put interest, period	15 years

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Affiliate Equity, Conditional Right to Put Interest, Period

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[Line Items] for Affiliate Equity [Table]

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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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