Stock-Based Compensation - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended				12 Months Ended			12 Months Ended				6 Months Ended	12 Months Ended
	Dec. 31, 2013 plan	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Maximum	Dec. 31, 2013 Maximum	Dec. 31, 2012 Maximum	Dec. 31, 2013 Stock Options	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options	Dec. 31, 2013 Stock Appreciation Rights (SARs) [Member]	Jun. 30, 2012 Restricted Stock	Dec. 31, 2013 Restricted Stock	Dec. 31, 2012 Restricted Stock	Dec. 31, 2011 Restricted Stock	Dec. 31, 2013 Performance-based Options	Dec. 31, 2013 Performance-based Restricted Shares	Dec. 31, 2013 Stock Incentive Plan 2011	Dec. 31, 2013 Stock Incentive Plan 2011 Stock Options	Dec. 31, 2013 Scenario, Forecast [Member] Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 6.3	$ 6.6	$ 6.9					$ 2.7	$ 3.3	$ 3.8			$ 3.6	$ 3.3	$ 3.1
Number of stock-based compensation award plans	5
Options expiration term	10 years										5 years								10 years
Number of shares authorized to award																		6,000,000
Number of shares available for grant																		2,168,693
Granted in period, shares	1,034,406	1,178,780	1,401,163													113,125	529,141
Award vesting period	4 years																	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period											3,100,000		837,443	708,573	385,049
Stock-based compensation awards consisting of stock options and restricted stock outstanding, number	3,332,242																	3,231,617
Aggregate Intrinsic Value	0.8	0	0	0.7		0.8	0.1
Intrinsic value of options exercised in period					0.1
Grants in period, weighted average grant date fair value (dollars per share)	$ 1.61	$ 2.53	$ 4.15
Tax benefit from stock-based compensation expense								0.9	1.1	1.3			1.5	1.4	1.3
Total unrecognized compensation expense related to non-vested stock								2.8					3.1
Total compensation cost not yet recognized, period for recognition								1 year 6 months 18 days				1 year 4 months 12 days
Total fair value of shares vested in period													$ 3.9	$ 3.3	$ 3.3
Percentage of Options That Vest if Minimum Trading Period Price is Reached											50.00%									50.00%
Vesting Period for Minimum Stock Price Average											30 days									30 days
Minimum Average Share Price for Vesting											$ 10									$ 15