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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 | Mar. 31, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Total debt, excluding unamortized issuance costs and discounts | $ 4,859.9 |
Recorded Amount |  |
Derivative [Line Items] |  |
Variable rate debt | 1,500.1 | $ 1,360.9
Fixed rate debt | 3,359.8 | 3,349.1
Total debt, excluding unamortized issuance costs and discounts | 4,859.9 | 4,710.0
Fair Value |  |
Derivative [Line Items] |  |
Variable rate debt | 1,500.1 | 1,360.9
Fixed rate debt | 3,399.0 | 3,395.4
Total debt, excluding unamortized issuance costs and discounts | $ 4,899.1 | $ 4,756.3

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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