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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

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