Fair Value - Additional Information (Details) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Feb. 04, 2013 GBP (£)	Mar. 31, 2014 USD ($)	Feb. 04, 2013 USD ($)	Mar. 31, 2014 Credit Facility First Lien Credit Facility Recurring fair value measurements Observable Inputs (Level 2) USD ($)	Dec. 31, 2013 Credit Facility First Lien Credit Facility Recurring fair value measurements Observable Inputs (Level 2) USD ($)	Mar. 31, 2014 Senior Secured Term Loan Senior Second Lien Notes Recurring fair value measurements Observable Inputs (Level 2) USD ($)	Dec. 31, 2013 Senior Secured Term Loan Senior Second Lien Notes Recurring fair value measurements Observable Inputs (Level 2) USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt				$ 477.9	$ 476.7	$ 338.4	$ 322.4
Number of shares purchased	1,712,392
Cost of investment	1.25		1.90
Conditional warrants issued	400,000
Current outstanding equity	2.00%
Warrant exercise price (GBP per share)	£ 0.79
Exercise period	2 years
Reduction in investment		$ 0.1