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Affiliate Equity - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Affiliate Equity
Distributions paid to affiliate partners	$ 370.5	$ 352.2	$ 354.1
Payments to acquire interest in affiliates	120.0	174.7	115.8
Issuance of interest in affiliates	6.3	9.0	$ 11.8
Other Assets
Affiliate Equity
Due from affiliates	16.2	12.4
Other Liabilities
Affiliate Equity
Due to affiliates	$ 36.2	$ 49.2
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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