Statement of Stockholders Equity Statement - USD ($) $ in Thousands, shares in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Common stock, shares outstanding		165.3
Stockholders' Equity Attributable to Parent	$ 5,297,100	$ 41,300	$ 79,600	$ 5,185,800	$ (7,900)	$ (1,700)
Treasury Stock, Common, Shares						0.0
Net income	399,900			399,900
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.9				0.5
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(46,100)	$ 200	33,800			$ (80,100)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	42,000		42,000
Stock Repurchased During Period, Value	269,400	$ 400	(400)			$ 269,400
Stock Repurchased During Period, Shares		1.7				1.7
Dividends	(92,500)			(92,500)
Other Comprehensive Income (Loss), Net of Tax	(3,200)				3,200
Net income	705,700
Common stock, shares outstanding		164.5
Stockholders' Equity Attributable to Parent	5,334,200	$ 41,100	155,800	5,493,200	(4,700)	$ (351,200)
Treasury Stock, Common, Shares						2.2
Net income	305,800			305,800
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.2				0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	12,800	$ 0	16,300			$ (3,500)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	45,300		45,300
Stock Repurchased During Period, Value	418,000	$ 700	(700)			$ 418,000
Stock Repurchased During Period, Shares		3.0				3.0
Dividends	(91,200)			(91,200)
Other Comprehensive Income (Loss), Net of Tax	300				(300)
Common stock, shares outstanding		161.7
Stockholders' Equity Attributable to Parent	$ 5,188,600	$ 40,400	218,100	5,707,800	(5,000)	$ (772,700)
Treasury Stock, Common, Shares						5.2
Common stock, shares outstanding	160.2	160.2
Stockholders' Equity Attributable to Parent	$ 5,469,000	$ 40,000	11,900	5,421,900	(4,800)	$ 0
Treasury Stock, Common, Shares						0.0
Net income	309,400			309,400
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.7				0.3
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(11,700)	$ 200	20,000			$ (31,900)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	49,700		49,700
Stock Repurchased and Retired During Period, Shares		(1.8)				(0.3)
Stock Repurchased and Retired During Period, Value	(166,300)	$ (500)	(77,700)	(120,000)		$ (31,900)
Dividends	(99,400)			(99,400)
Other Comprehensive Income (Loss), Net of Tax	800				(800)
Net income	542,200
Common stock, shares outstanding		159.1
Stockholders' Equity Attributable to Parent	5,549,900	$ 39,700	3,900	5,511,900	(5,600)	$ 0
Treasury Stock, Common, Shares						0.0
Net income	232,800			232,800
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		0.2				0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	14,900	$ 0	15,600			$ (700)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	43,000		43,000
Stock Repurchased and Retired During Period, Shares		(0.1)				0.0
Stock Repurchased and Retired During Period, Value	(9,100)	$ 0	(6,300)	(3,500)		$ (700)
Dividends	(98,600)			(98,600)
Other Comprehensive Income (Loss), Net of Tax	$ 0				0
Common stock, shares outstanding	159.2	159.2
Stockholders' Equity Attributable to Parent	$ 5,732,900	$ 39,700	$ 56,200	$ 5,642,600	$ (5,600)	$ 0
Remaining amount authorized fro stock repurchase	$ 2,000,000
Treasury Stock, Common, Shares						0.0