Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of information regarding stock options outstanding
Options outstanding, Number of Shares	3,155,631	3,267,838	4,000,526	5,041,235
Options outstanding, Weighted Average Exercise Price	$ 6.65	$ 6.61	$ 6.26	$ 7.99
Options outstanding, Weighted Average Remaining Contractual Life (years)	5 years 2 months 27 days	5 years 6 months 11 days	6 years 4 months 21 days
Options outstanding, Aggregate Intrinsic Value	$ 3.5	$ 1.3	$ 5.5
Options vested and expected to vest using estimated forfeiture rates, Number of Shares	3,019,979	3,151,950	3,798,092
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price	$ 6.67	$ 6.62	$ 6.32
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years)	5 years 2 months 1 day	5 years 5 months 9 days	6 years 3 months
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value	3.4	1.3	5.1
Options exercisable, Number of Shares	2,329,987	2,377,683	2,541,701
Options exercisable, Weighted Average Exercise Price	$ 6.91	$ 6.99	$ 6.80
Options exercisable, Weighted Average Remaining Contractual Life (years)	4 years 8 months 9 days	4 years 7 months 10 days	5 years 11 days
Options exercisable, Aggregate Intrinsic Value	$ 2.5	$ 0.8	$ 2.9