Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Computations of basic and diluted earnings per share for Income from Continuing Operations

	For the Years Ended December 31,
	2011		2010		2009
Net income	$	88.3	$	116.2	$	51.1
Add: Loss from discontinued operations		—		0.9		10.7
Income from continuing operations	$	88.3	$	117.1	$	61.8
Weighted-average shares outstanding — basic		52.5		54.6		55.6
Effect of dilutive securities		0.9		1.2		1.0
Weighted-average shares outstanding — diluted		53.4		55.8		56.6
Earnings per share from continuing operations:
Basic	$	1.68	$	2.14	$	1.11
Diluted	$	1.65	$	2.10	$	1.09

Stock appreciation rights were outstanding but not included in diluted earnings per share calculation

	For the Years Ended December 31,
	2011		2010		2009
Stock appreciation rights (number of shares)		1,466,149		273,429		—
Price ranges per share	$	34.06 –46.78	$	46.78	$	N/A