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Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other current assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 3.9 $ 3.9
Less than wholly-owned subsidiaries    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 13.3 31.0
Majority-owned Joint Ventures    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 3.1 $ 20.5