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Cash and Cash Equivalents - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 3.9 $ 3.6
Other Current Assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents   0.6
Other Assets    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 3.9 3.0
Subsidiaries    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents 31.0 31.1
Consolidated Entity Excluding Variable Interest Entities (VIE)    
Cash and Cash Equivalents [Line Items]    
Restricted cash and cash equivalents $ 20.5 $ 18.9