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Debt - Short-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Total short-term debt $ 162.5 $ 406.3
Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Notes outstanding under revolving credit facility 100.0 350.0
Term Loan [Member]    
Short-term Debt [Line Items]    
Term loan - current maturities $ 62.5 $ 56.3