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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 5.25% Senior Notes due April 2023 | Mar. 31, 2013 5.25% Senior Notes due April 2023 | Dec. 31, 2012 5.25% Senior Notes due April 2023 | Sep. 30, 2013 12% Senior Notes due February 2014 | Dec. 31, 2012 12% Senior Notes due February 2014 | Sep. 30, 2013 7.875% Senior Notes due June 2017 | Dec. 31, 2012 7.875% Senior Notes due June 2017 | Sep. 30, 2013 8.125% Senior Notes due September 2019 | Dec. 31, 2012 8.125% Senior Notes due September 2019 | Sep. 30, 2013 6.50% Senior Notes due December 2020 | Dec. 31, 2012 6.50% Senior Notes due December 2020 | Sep. 30, 2013 8.375% Senior Notes due September 2021 | Dec. 31, 2012 8.375% Senior Notes due September 2021 | Sep. 30, 2013 6.875% Senior Notes due July 2033 | Dec. 31, 2012 6.875% Senior Notes due July 2033 | Sep. 30, 2013 Term Loan A Facility | Sep. 30, 2013 Term Loan B Facility | Sep. 30, 2013 Term Loan A Facility due October 2016 | Dec. 31, 2012 Term Loan A Facility due October 2016 | Sep. 30, 2013 Term Loan B Facility due October 2018 | Dec. 31, 2012 Term Loan B Facility due October 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized lender fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.0 | $ 15.4 | $ 9.4 | $ 10.7
Unamortized discount |  |  |  |  |  |  |  |  | 5.5 |  |  |  |  |  |  |  | 1.4 | 1.4 |  |  |  |  | 13.8 | 15.6
Debt interest rate |  |  |  | 5.25% | 5.25% | 5.25% | 12.00% | 12.00% | 7.875% | 7.875% | 8.125% | 8.125% | 6.50% | 6.50% | 8.375% | 8.375% | 6.875% | 6.875% |  |  |  |  |  |
Repurchase aggregate principal amount |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate | 6.20% |  | 6.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of long-term debt | $ 456.1 | $ 88.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51.0 | $ 4.0 |  |  |  |

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- Definition Unamortized lender fees. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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