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Debt Debt (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Maturities of Long-term Debt [Abstract]    
Total long-term debt $ 1,150.1 $ 1,297.5
Less than 1 year 16.0  
1-3 years 636.6  
After 5 years $ 497.5