Long-Term Debt -Senior Notes due 2015 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended					1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Senior PIK Exchange Notes due 2015 [Member]	Mar. 31, 2013 Senior PIK Interest Exchange Notes due 2015 [Member]	Mar. 31, 2013 Senior Exchange Notes due 2015 [Member]	Mar. 31, 2012 Senior Notes, due 2015 [Member]	Mar. 31, 2013 Senior Notes, due 2015 [Member]	Dec. 31, 2012 Senior Notes, due 2015 [Member]	Feb. 17, 2012 Senior Notes, due 2015 [Member]	Dec. 31, 2011 Senior Notes, due 2015 [Member]	Feb. 29, 2012 2019 Senior Notes, due 2019 [Member]	Mar. 31, 2013 2019 Senior Notes, due 2019 [Member]	Dec. 31, 2012 2019 Senior Notes, due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, stated interest rate			11.50%	12.25%	11.00%							8.50%
Debt, short-term and long-term							$ 0	$ 0		$ 129.0		$ 1,305.0	$ 1,305.0
Proceeds from Issuance of long-term Debt	0	135.7									130.0
Net loss on extinguishments of long-term debt	3.9	9.4				9.4
Write off of unamortized deferred financing costs						1.5
Extinguishment of Debt, Fees Paid to Lenders									$ 7.9