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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended																		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 5.25% Senior Notes due April 2023 [Member]	Mar. 31, 2013 5.25% Senior Notes due April 2023 [Member]	Dec. 31, 2012 5.25% Senior Notes due April 2023 [Member]	Jun. 30, 2013 12% Senior Notes due February 2014 [Member]	Dec. 31, 2012 12% Senior Notes due February 2014 [Member]	Jun. 30, 2013 7.875% Senior Notes due June 2017 [Member]	Dec. 31, 2012 7.875% Senior Notes due June 2017 [Member]	Jun. 30, 2013 8.125% Senior Notes due September 2019 [Member]	Dec. 31, 2012 8.125% Senior Notes due September 2019 [Member]	Jun. 30, 2013 6.50% Senior Notes due December 2020 [Member]	Dec. 31, 2012 6.50% Senior Notes due December 2020 [Member]	Jun. 30, 2013 8.375% Senior Notes due September 2021 [Member]	Dec. 31, 2012 8.375% Senior Notes due September 2021 [Member]	Jun. 30, 2013 6.875% Senior Notes due July 2033 [Member]	Dec. 31, 2012 6.875% Senior Notes due July 2033 [Member]	Jun. 30, 2013 Term Loan A Facility [Member]	Jun. 30, 2013 Term Loan B Facility due October 2018 [Member]	Jun. 30, 2013 Term Loan A Facility due October 2016 [Member]	Dec. 31, 2012 Term Loan A Facility due October 2016 [Member]	Jun. 30, 2013 Term Loan B Facility due October 2018 [Member]	Dec. 31, 2012 Term Loan B Facility due October 2018 [Member]
Debt Instrument [Line Items]
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%
Unamortized lender fees																					$ 12.0	$ 15.4	$ 9.7	$ 10.7
Unamortized discount										5.5							1.4	1.4					14.2	15.6
Payments of long-term debt	455.6	58.8																	51.0	4.0
Repurchase aggregate principal amount									$ 400
Weighted average interest rate	6.20%		6.40%

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Unamortized lender fees.

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- Definition

Interest rate stated in the contractual 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



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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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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



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-Paragraph 31

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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