Stock-Based and Other Incentive Compensation - Stock Options (Details) (Stock Options, USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Number of Options (in shares):
Options outstanding at the beginning of the period	3,461
Granted	235
Exercised	(113)
Cancelled	(952)
Options outstanding at the end of the period	2,631	3,461
Options exercisable at the end of the period	1,261
Options expected to vest at the end of the period	1,371
Weighted Average Remaining Contract Term (Years)
Options outstanding - weighted average remaining contract term (in years)	4 years 2 months 12 days	7 years 9 months 18 days
Options exercisable - weighted average remaining contract term (in years)	3 years 4 months 24 days
Options expected to vest - weighted average remaining contract term (in years)	5 years
Weighted Average Exercise Price (in dollars per share):
Options outstanding, beginning of period	$ 10.46	$ 9.34
Granted	$ 17.73
Exercised	$ 9.87
Cancelled	$ 8.25
Options outstanding, end of period	$ 10.46	$ 9.34
Options exercisable at end of period	$ 10.31
Options expected to vest after end of period	$ 10.60
Aggregate Intrinsic Value
Aggregate intrinsic value of options outstanding, beginning of period (in dollars)	$ 17.8	$ 0.7
Aggregate intrinsic value of options exercised (in dollars)	0.6	0.5	0.3
Aggregate intrinsic value of options outstanding end of period (in dollars)	17.8	0.7
Options Exercisable - aggregate intrinsic value (in dollars)	9.0
Options expected to vest - aggregate intrinsic value (in dollars)	8.8
Assumptions:
Expected volatility (as a percent)	60.00%	56.00%	52.00%
Risk-free interest rate (as a percent)	2.20%	1.30%	1.90%
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Expected life (in years)	6 years	6 years	6 years
Stock-based compensation, additional disclosures
Grants, weighted average grant date fair value	$ 10.16	$ 4.65	$ 4.10
Stock-based compensation expense recognized	2.0	4.3	6.3
Tax benefit recognized related to stock based compensation expenses	0.7	1.7	2.4
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized	3.7
Weighted-average period of amortization	2 years
Cash received from exercise of stock options	1.1
Actual tax benefit realized for the tax deductions from option exercise of the stock based payment arrangements	$ 0.2