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Debt Debt Maturities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Interest paid $ 132.3 $ 414.2 $ 404.4
Debt Instrument, Unamortized Discount (Premium), Net $ 89.0