The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Significant Accounting Policies (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 item	Dec. 31, 2011 PIK toggle notes	Dec. 31, 2010 PIK toggle notes	Sep. 30, 2012 Floating Rate Notes	Dec. 31, 2011 Floating Rate Notes	Dec. 31, 2010 Floating Rate Notes
Fair Value of Other Financial Instruments
Fair Value		$ 417.0	$ 240.9	$ 228.6	$ 208.2	$ 210.9
Segment Information
Number of reporting segments	3