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Cash and Cash Equivalents - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 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 0.6 2.0
Subsidiaries    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 31.1 24.1
Consolidated Entity Excluding Variable Interest Entities (VIE)    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 18.9 $ 10.9