Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2011

Stockholders' Equity [Abstract]

Total share-based compensation expense

	Three Months					Nine Months
	Ended					Ended
	September 30,					September 30,
	2011			2010		2011		2010
2011 Three-year PSU Awards	$	0.7		$	—	$	2.5	$	—
2010 Three-year PSU Awards		0.8			0.8		4.6		2.3
2009 Two-year PSU Awards		—			3.2		—		7.2
2009 Three-year PSU Awards		1.2			2.1		3.6		4.8
SLO Awards		(0.3	)		0.2		0.3		0.6
Other long-term share-based incentive compensation programs		2.1			2.2		6.7		7.1
Total share-based incentive compensation expense	$	4.5		$	8.5	$	17.7	$	22.0

Estimated amount of total share-based compensation expense

	2011		2012		2013		2014		Total
2011 Three-year PSU Awards	$	0.8	$	3.4	$	3.4	$	—	$	7.6
2010 Three-year PSU Awards		1.1		4.3		—		—		5.4
2009 Three-year PSU Awards		1.7		—		—		—		1.7
SLO Awards		0.1		0.1		—		—		0.2
Other long-term share-based incentive compensation programs		2.6		8.5		4.9		0.7		16.7
Total share-based incentive compensation expense	$	6.3	$	16.3	$	8.3	$	0.7	$	31.6