Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions - Other Related Party Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Related party transactions
Loan to related party	$ 16.1
Earnings from equity method investees	16.7	$ 0.0	$ 0.0
Affiliated Entity And Joint Ventures Of Affiliated Entity
Related party transactions
Earnings from equity method investees	$ 2.8	$ 2.7	$ 14.5
Loan to Equity-Method Affiliate
Related party transactions
Loan to related party				$ 4.5