Discontinued Operations (Details 3) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basic and diluted earnings per share numerators (in millions):
Net income (loss)	$ 11.7	$ 2.5	$ (16.5)	$ (37.1)
Basic earnings per share denominators (in thousands):
Average common shares outstanding during the period (in shares)	7,886	8,571	7,930	8,656
Average unvested restricted shares (in shares)	73	100	65	96
Basic earnings per share denominator (in shares)	7,959	8,671	7,995	8,752
Diluted earnings per share denominator (in thousands):
Average common shares outstanding during the period (in shares)	7,886	8,571	7,930	8,656
Average unvested restricted shares (in shares)	73	100	65	96
Diluted earnings (loss) per share denominator (in shares)	7,959	8,671	7,995	8,752
Discontinued Operations.
Basic and diluted earnings per share numerators (in millions):
Net income (loss)	$ (0.3)	$ 1.8	$ 2.9	$ (0.8)
Basic earnings per share denominators (in thousands):
Average common shares outstanding during the period (in shares)	7,886	8,571	7,930	8,656
Average unvested restricted shares (in shares)	73	100	65	96
Basic earnings per share denominator (in shares)	7,959	8,671	7,995	8,752
Diluted earnings per share denominator (in thousands):
Average common shares outstanding during the period (in shares)	7,886	8,571	7,930	8,656
Average unvested restricted shares (in shares)	73	100	65	96
Diluted earnings (loss) per share denominator (in shares)	7,959	8,671	7,995	8,752
Basic and diluted earnings (loss) per share (in dollars):	$ (0.03)	$ 0.20	$ 0.36	$ (0.09)