Statement of Stockholders Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Common Stock, Shares, Outstanding		160,200
Stockholders' Equity Attributable to Parent	$ 5,469,000	$ 40,000	$ 11,900	$ 5,421,900	$ (4,800)	$ 0
Treasury Stock, Common, Shares						0
Net income	309,400			309,400
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		700				300
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, Value				(120,000)
Stock Repurchased During Period, Value	166,300	$ 500	77,700			$ (31,900)
Stock Repurchased During Period, Shares		(1,800)				(300)
Dividends	(99,400)			(99,400)
Other Comprehensive Income (Loss), Net of Tax	800				(800)
Treasury Stock, Value, Acquired, Par Value Method	$ 166,200
Treasury Stock, Shares, Acquired	1,800
Common Stock, Shares, Outstanding		159,100
Stockholders' Equity Attributable to Parent	$ 5,549,900	$ 39,700	3,900	5,511,900	(5,600)	$ 0
Treasury Stock, Common, Shares						0
Common Stock, Shares, Outstanding	159,500	159,500
Stockholders' Equity Attributable to Parent	$ 6,082,700	$ 39,900	172,400	5,876,000	(5,600)	$ 0
Treasury Stock, Common, Shares						0
Net income	231,300			231,300
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)		700				400
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(30,400)	$ 200	2,100			$ (32,700)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	52,600		52,600
Stock Repurchased and Retired During Period, Shares		0				(400)
Stock Repurchased and Retired During Period, Value	0	$ 0	(32,700)	0		$ (32,700)
Dividends	(108,900)			(108,900)
Other Comprehensive Income (Loss), Net of Tax	$ 100				(100)
Common Stock, Shares, Outstanding	160,200	160,200
Stockholders' Equity Attributable to Parent	$ 6,227,200	$ 40,100	$ 194,400	$ 5,998,400	$ (5,700)	$ 0
Remaining amount authorized fro stock repurchase	$ 2,000,000
Treasury Stock, Common, Shares						0