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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Total debt, excluding unamortized issuance costs and discounts $ 4,430.6  
Recorded Amount    
Derivative [Line Items]    
Variable rate debt 1,069.8 $ 1,360.9
Fixed rate debt 3,360.8 3,348.4
Total debt, excluding unamortized issuance costs and discounts 4,430.6 4,709.3
Fair Value    
Derivative [Line Items]    
Variable rate debt 1,069.8 1,360.9
Fixed rate debt 3,526.7 3,395.4
Total debt, excluding unamortized issuance costs and discounts $ 4,596.5 $ 4,756.3