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Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount $ 3,806.8 $ 1,515.8
Convertible Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount 953.6 925.0
Long-term debt, including current portion, Fair Value 1,160.9 1,041.9
Long-term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion, Carrying Amount 2,616.3 386.9
Long-term debt, including current portion, Fair Value $ 2,731.5 $ 386.6