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Cash and Marketable Securities - Components of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents $ 40.5 $ 61.6 $ 66.7 $ 64.5
Total restricted cash 60.9 45.9    
Restricted Marketable Securities 57.7 56.2    
Total 159.1 163.7    
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents 40.5 61.6    
Total restricted cash 60.9 45.9    
Restricted Marketable Securities 0.0 0.0    
Total 101.4 107.5    
Equity Securities [Member]        
Cash and Cash Equivalents [Line Items]        
Cash & Cash Equivalents 0.0 0.0    
Total restricted cash 0.0 0.0    
Restricted Marketable Securities 57.7 56.2    
Total $ 57.7 $ 56.2