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Debt - Short-term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Total short-term debt $ 150.0 $ 700.0
Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Notes outstanding under revolving credit facility 100.0 650.0
Term Loan [Member]    
Short-term Debt [Line Items]    
Term loan - current maturities $ 50.0 $ 50.0