Earnings Per Share Table (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share [Abstract]
Net income, basic	$ 10.1	$ 8.5	$ 13.7	$ 9.0
Weighted-average shares outstanding, basic EPS	11.4	11.5	11.4	11.4
Net income per common share, basic EPS	$ 0.89	$ 0.74	$ 1.20	$ 0.79
Effect of dilutive common share equivalents: [Abstract]
Incremental common shares attributable to share-based payment arrangements, restricted stock units	0.1	0	0.1	0.1
Net income per common share, restricted stock units	$ (0.01)	$ 0.00	$ (0.01)	$ 0.00
Incremental common shares attributable to share-based payment arrangements, stock options	0.1	0.1	0.1	0.1
Net income per common share, stock options	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.01)
Incremental common shares attributable to warrants	0	0.3	0	0.3
Net income per common share, warrants	$ 0.00	$ (0.01)	$ 0.00	$ (0.02)
Net income, diluted	$ 10.1	$ 8.5	$ 13.7	$ 9.0
Weighted-average shares outstanding, diluted EPS	11.6	11.9	11.6	11.9
Net income per common share, diluted EPS	$ 0.87	$ 0.72	$ 1.18	$ 0.76