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Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 3.6  
Other assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 3.0  
Other current assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 0.6  
Less than wholly-owned subsidiaries    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 17.6 $ 31.1
Majority-owned Joint Ventures    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 12.3 $ 18.9