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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 1,973.2 | $ 1,718.7
Debt Issuance Costs | (18.4) | (24.2)
Long-Term Debt, Net | 1,954.8 | 1,694.5
Less — Current portion | (23.1) | (240.5)
Long-term debt | 1,931.7 | 1,454.0
Credit Agreement — Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 490.6 | 0.0
Debt Issuance Costs | (2.2) | (2.7)
Long-Term Debt, Net | $ 488.4 | $ (2.7)
Weighted Average Interest Rate | 1.78% |
8.125% Senior Notes due 2020 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 8.125% | 8.125%
Long-Term Debt | $ 0.0 | $ 243.7
Debt Issuance Costs | 0.0 | (3.2)
Long-Term Debt, Net | $ 0.0 | $ 240.5
Weighted Average Interest Rate |  | 8.25%
4.75% Senior Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.75% | 4.75%
Long-Term Debt | $ 500.0 | $ 500.0
Debt Issuance Costs | (5.5) | (6.4)
Long-Term Debt, Net | $ 494.5 | $ 493.6
Weighted Average Interest Rate | 4.75% | 4.75%
5.375% Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.375% | 5.375%
Long-Term Debt | $ 325.0 | $ 325.0
Debt Issuance Costs | (3.2) | (3.6)
Long-Term Debt, Net | $ 321.8 | $ 321.4
Weighted Average Interest Rate | 5.375% | 5.375%
5.25% Senior Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.25% | 5.25%
Long-Term Debt | $ 650.0 | $ 650.0
Debt Issuance Costs | (7.5) | (8.3)
Long-Term Debt, Net | $ 642.5 | $ 641.7
Weighted Average Interest Rate | 5.25% | 5.25%
Other |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 7.6 | $ 0.0
Debt Issuance Costs | 0.0 | 0.0
Long-Term Debt, Net | $ 7.6 | $ 0.0

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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