Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands, shares in Millions	Total	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Common stock, shares outstanding		160.2
Treasury stock, common, shares			0.0
Balances	$ 5,469,000	$ 40,000	$ 0	$ 11,900	$ 5,421,900	$ (4,800)
Net income	309,400				309,400
Exercise and settlement of share-based awards, net of shares withheld for taxes (in shares)		0.7	0.3
Exercise and settlement of share-based awards, net of shares withheld for taxes	(11,700)	$ 200	$ (31,900)	20,000
Share-based compensation expense	49,700			49,700
Repurchase and retirement of common stock (in shares)		(1.8)	(0.3)
Repurchase and retirement of common stock	166,300	$ 500	$ 31,900	77,700	120,000
Dividends declared	(99,400)				(99,400)
Other comprehensive loss	(800)					(800)
Net income	542,200
Common stock, shares outstanding		159.1
Treasury stock, common, shares			0.0
Balances	5,549,900	$ 39,700	$ 0	3,900	5,511,900	(5,600)
Net income	232,800				232,800
Exercise and settlement of share-based awards, net of shares withheld for taxes (in shares)		0.2	0.0
Exercise and settlement of share-based awards, net of shares withheld for taxes	14,900	$ 0	$ (700)	15,600
Share-based compensation expense	43,000			43,000
Repurchase and retirement of common stock (in shares)		(0.1)	0.0
Repurchase and retirement of common stock	9,100	$ 0	$ 700	6,300	3,500
Dividends declared	(98,600)				(98,600)
Common stock, shares outstanding		159.2
Treasury stock, common, shares			0.0
Balances	$ 5,732,900	$ 39,700	$ 0	56,200	5,642,600	(5,600)
Common stock, shares outstanding	159.5	159.5
Treasury stock, common, shares			0.0
Balances	$ 6,082,700	$ 39,900	$ 0	172,400	5,876,000	(5,600)
Net income	231,300				231,300
Exercise and settlement of share-based awards, net of shares withheld for taxes (in shares)		0.7	0.4
Exercise and settlement of share-based awards, net of shares withheld for taxes	(30,400)	$ 200	$ (32,700)	2,100
Share-based compensation expense	52,600			52,600
Repurchase and retirement of common stock (in shares)		0.0	(0.4)
Repurchase and retirement of common stock	0	$ 0	$ 32,700	32,700	0
Dividends declared	(108,900)				(108,900)
Other comprehensive loss	(100)					(100)
Net income	414,600
Common stock, shares outstanding		160.2
Treasury stock, common, shares			0.0
Balances	6,227,200	$ 40,100	$ 0	194,400	5,998,400	(5,700)
Net income	183,300				183,300
Exercise and settlement of share-based awards, net of shares withheld for taxes (in shares)		0.2	0.0
Exercise and settlement of share-based awards, net of shares withheld for taxes	17,500	$ 0	$ (600)	18,100
Share-based compensation expense	40,300			40,300
Repurchase and retirement of common stock (in shares)		0.0	0.0
Repurchase and retirement of common stock	0	$ 0	$ 600	600	0
Dividends declared	$ (109,100)				(109,100)
Common stock, shares outstanding	160.4	160.4
Treasury stock, common, shares			0.0
Balances	$ 6,359,200	$ 40,100	$ 0	$ 252,200	$ 6,072,600	$ (5,700)