Long-Term Debt -Debt Balances and Interest Rates (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Revolving Loan [Member]		Dec. 31, 2012 Revolving Loan [Member]	Sep. 30, 2013 Term Loan [Member]		Jul. 31, 2013 Term Loan [Member]	Apr. 29, 2013 Term Loan [Member]	Dec. 31, 2012 Term Loan [Member]	Sep. 30, 2013 Senior Secured Notes, due 2018 [Member]		Dec. 31, 2012 Senior Secured Notes, due 2018 [Member]	Sep. 30, 2013 2019 Senior Notes, due 2019 [Member]		Dec. 31, 2012 2019 Senior Notes, due 2019 [Member]	Oct. 18, 2013 Subordinated Debt [Member]	Sep. 30, 2013 Subordinated Debt [Member]		Dec. 31, 2012 Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term			$ 0		$ 0	$ 1,532.8				$ 1,339.5	$ 325.0		$ 500.0	$ 1,305.0		$ 1,305.0	$ 92.5	$ 247.5		$ 621.5
Debt Instrument, Unamortized Discount						(4.6)		1.4	3.4	0
Premium, unamortized														4.4		5.0
Debt, total short-term and long-term	3,410.1	3,771.0
Current maturities of long-term debt	(170.4)	(40.0)
Debt	$ 3,239.7	$ 3,731.0
Long-term Debt, weighted average interest rate			0.00%	[1]		3.50%	[1]				8.00%	[1]		8.50%	[1]			12.535%	[1]

[1] Interest rate at September 30, 2013