Long-Term Debt and Redeemable Preferred Stock - Components of Long-Term Debt and Redeemable Preferred Stock (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument And Redeemable Preferred Stock [Line Items]
Long-term debt, gross	$ 1,168.8	$ 1,173.4
Less current portion	(8.0)	(8.0)
Long-term debt noncurrent	1,160.8	1,165.4
Redeemable preferred stock	48.3	48.4
Long-term debt and redeemable preferred stock	1,209.1	1,213.8
2011 Term Loan Facility Due 2017 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Term Loan Facility, net of discounts	782.6	787.6
2011 Revolving Credit Facility Due 2016 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Revolving Credit Facility
Senior Subordinated Term Loan Due 2014 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Subordinated Term Loan		58.4
Amended And Restated Senior Subordinated Term Loan Due 2014 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Subordinated Term Loan	58.4
9 3/4% Senior Secured Notes Due 2015 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Secured Notes, net of discounts	$ 327.8	$ 327.4