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Debt - Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt    
Total $ 1,942.1 $ 2,319.1
Less: unamortized discount and debt issuance cost (13.4) (17.1)
Less: amounts due within one year and short-term borrowings (500.8) (93.9)
Total long-term debt 1,427.9 2,208.1
Unsecured revolving credit facility due April 4, 2018    
Debt    
Total 332.0 675.0
Unsecured term loan due from March 31, 2016 to April 4, 2018    
Debt    
Total 398.8 442.5
Senior unsecured notes due November 15, 2016    
Debt    
Total 350.0 350.0
Senior unsecured notes due April 15, 2023    
Debt    
Total 500.0 500.0
Senior unsecured notes due November 15, 2036    
Debt    
Total 250.0 250.0
Other notes and revolving credit facilities    
Debt    
Total $ 111.3 $ 101.6