Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2011

Stockholders' Equity [Abstract]

Total share-based compensation expense

	Three Months				Six Months
	Ended				Ended
	June 30,				June 30,
	2011		2010		2011		2010
2011 Three-year PSU Awards	$	0.9	$	—	$	1.8	$	—
2010 Three-year PSU Awards		3.0		0.7		3.8		1.5
2009 Two-year PSU Awards		—		2.0		—		4.0
2009 Three-year PSU Awards		0.9		1.4		2.4		2.7
SLO Awards		0.2		0.1		0.6		0.4
Other long-term share-based incentive compensation programs		2.4		1.8		4.6		4.9
Total share-based incentive compensation expense	$	7.4	$	6.0	$	13.2	$	13.5

Estimated amount of total share-based compensation expense

	2011		2012		2013		2014		Total
2011 Three-year PSU Awards	$	1.8	$	3.6	$	3.6	$	—	$	9.0
2010 Three-year PSU Awards		2.3		4.5		—		—		6.8
2009 Three-year PSU Awards		3.8		—		—		—		3.8
SLO Awards		0.6		0.3		—		—		0.9
Other long-term share-based incentive compensation programs		4.8		7.5		4.0		0.6		16.9
Total share-based incentive compensation expense	$	13.3	$	15.9	$	7.6	$	0.6	$	37.4