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Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 3.0 $ 3.0
Other current assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 2.0 2.0
Less than wholly-owned subsidiaries    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 15.1 24.1
Majority-owned Joint Ventures    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 20.7 $ 10.9