Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2011

Stockholders' Equity

Components of Comprehensive Income, Net of Tax

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
Net income	$	117.4		$	88.7		$	221.5		$	174.0
Foreign currency translation gains (losses)		0			(0.4	)		0.3			(0.6	)
Unrealized gains (losses) on derivative instruments, net of tax:
Unrealized gains (losses) on derivative instruments		(0.1	)		1.1			(1.7	)		3.1
Reclassification adjustment for (gains) losses on derivative instruments recognized during the period		1.0			(2.2	)		1.6			(3.1	)
Unrealized gains on available-for-sale securities, net of tax		2.4			0			0.8			0
Total other comprehensive income	$	120.7		$	87.2		$	222.5		$	173.4

Components of Accumulated Other Comprehensive Income

	June 30, 2011		December 31, 2010
Foreign currency translation gains	$	0.4	$	0.1
Accumulated net realized gains on derivatives, net of tax		0.1		0.2
Accumulated net unrealized gains on available-for-sale securities, net of tax		2.1		1.3
Total accumulated other comprehensive income	$	2.6	$	1.6