Statement of Stockholders Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	2021 Stock Repurchase Plan [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Common stock, shares outstanding			170,100
Stockholders' Equity Attributable to Parent	$ 4,122,300		$ 42,500	$ (3,412,900)	$ 3,188,000	$ 4,312,600	$ (7,900)
Treasury Stock, Shares				60,100
Net income	257,100					257,100
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			1,100	300
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	8,200		$ 300	$ (26,700)	34,600
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	29,100				29,100
Stock Repurchased During Period, Value	74,200		$ 200	$ 74,200	(200)
Stock Repurchased During Period, Shares			700	700
Dividends	(75,100)					(75,100)
Other Comprehensive Income (Loss), Net of Tax	100						(100)
Net income	567,900
Treasury Stock, Retired, Cost Method, Amount				$ 0
Common stock, shares outstanding			170,500
Stockholders' Equity Attributable to Parent	4,267,300		$ 42,600	$ (3,513,800)	3,251,900	4,494,600	(8,000)
Treasury Stock, Shares				61,100
Net income	181,100					181,100
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			300	0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	18,500		$ 100	$ (2,000)	20,400
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	34,100				34,100
Stock Repurchased During Period, Value	283,800		$ 800	$ 283,800	(800)
Stock Repurchased During Period, Shares			3,200	3,200
Dividends	(74,900)					(74,900)
Other Comprehensive Income (Loss), Net of Tax	(500)						500
Common stock, shares outstanding			167,600
Stockholders' Equity Attributable to Parent	4,142,800		$ 41,900	$ (3,799,600)	3,307,200	4,600,800	(7,500)
Treasury Stock, Shares				64,300
Net income	129,700					129,700
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			200	0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	6,800		$ 100	$ (2,200)	8,900
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	35,200				35,200
Stock Repurchased During Period, Value	58,500		$ 200	$ 58,500	(200)
Stock Repurchased During Period, Shares			700	700
Dividends	(73,500)					(73,500)
Other Comprehensive Income (Loss), Net of Tax	100						(100)
Common stock, shares outstanding			167,100
Stockholders' Equity Attributable to Parent	$ 4,182,400		$ 41,800	$ (3,860,300)	3,351,500	4,657,000	(7,600)
Treasury Stock, Shares				65,000
Common stock, shares outstanding	165,600		165,600
Stockholders' Equity Attributable to Parent	$ 4,164,200		$ 41,400	$ (4,093,500)	3,403,700	4,820,400	(7,800)
Treasury Stock, Shares				66,700
Net income	509,300
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			700	400
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(45,000)		$ 200	$ (47,800)	2,600
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	64,900				64,900
Stock Repurchased During Period, Value	195,600		$ 400		(400)
Stock Repurchased During Period, Shares			1,400	1,400
Dividends	(83,000)					(83,000)
Other Comprehensive Income (Loss), Net of Tax	(100)						100
Net income	1,172,000
Treasury Stock, Retired, Cost Method, Amount				$ (4,342,600)
Common stock, shares outstanding			164,900
Stockholders' Equity Attributable to Parent	4,414,900		$ 41,200	$ (4,336,900)	3,471,600	5,246,700	(7,700)
Treasury Stock, Shares				68,500
Net income	325,000
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			200	0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	13,400		$ 100	$ (3,600)	16,900
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	41,700				41,700
Dividends	(82,600)					(82,600)
Other Comprehensive Income (Loss), Net of Tax	100						(100)
Common stock, shares outstanding			165,100
Stockholders' Equity Attributable to Parent	4,712,300		$ 41,300	$ (4,340,500)	3,530,200	5,489,100	(7,800)
Treasury Stock, Shares				68,500
Net income	337,800
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0	0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(1,500)		$ 0	$ (2,200)	700
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	36,900				36,900
Treasury Stock, Retired, Cost Method, Amount	$ 0			(4,342,600)	(3,550,300)	(792,300)
Treasury Stock, Shares, Retired	(68,500)
Dividends	$ (82,500)					(82,500)
Other Comprehensive Income (Loss), Net of Tax	$ 200						(200)
Common stock, shares outstanding	165,100		165,100
Stockholders' Equity Attributable to Parent	$ 5,002,800		$ 41,300	$ (100)	$ 17,500	$ 4,952,100	$ (8,000)
Treasury Stock, Shares				0
Remaining amount authorized fro stock repurchase		$ 2,000,000