Statement of Stockholders Equity Statement - USD ($) shares in Millions, $ in Millions	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			165.6
Stockholders' Equity Attributable to Parent	$ 4,164.2		$ 41.4	$ (4,093.5)	$ 3,403.7	$ 4,820.4	$ (7.8)
Treasury Stock, Shares				66.7
Net income	509.3					509.3
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.7	0.4
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(17.5)		$ 0.2	$ (47.8)	30.1
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	37.4				37.4
Stock Repurchased During Period, Value	195.6		$ 0.4	$ 195.6	(0.4)
Stock Repurchased During Period, Shares			1.4	1.4
Dividends	(83.0)					(83.0)
Other Comprehensive Income (Loss), Net of Tax	(0.1)						0.1
Net income	1,172.0
Treasury Stock, Retired, Cost Method, Amount				$ (4,342.6)
Common stock, shares outstanding			164.9
Stockholders' Equity Attributable to Parent	4,414.9		$ 41.2	$ (4,336.9)	3,471.6	5,246.7	(7.7)
Treasury Stock, Shares				68.5
Net income	325.0					325.0
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.2	0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	13.4		$ 0.1	$ (3.6)	16.9
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	41.7				41.7
Dividends	(82.6)					(82.6)
Other Comprehensive Income (Loss), Net of Tax	0.1						(0.1)
Common stock, shares outstanding			165.1
Stockholders' Equity Attributable to Parent	4,712.3		$ 41.3	$ (4,340.5)	3,530.2	5,489.1	(7.8)
Treasury Stock, Shares				68.5
Net income	337.8					337.8
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.0	0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(1.5)		$ 0.0	$ (2.2)	0.7
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	36.9				36.9
Treasury Stock, Retired, Cost Method, Amount				$ (4,342.6)	(3,550.3)	(792.3)
Treasury Stock, Shares, Retired				(68.5)
Stock Repurchased During Period, Value	0.0
Dividends	(82.5)					(82.5)
Other Comprehensive Income (Loss), Net of Tax	0.2						(0.2)
Common stock, shares outstanding			165.1
Stockholders' Equity Attributable to Parent	$ 5,002.8		$ 41.3	$ (0.1)	17.5	4,952.1	(8.0)
Treasury Stock, Shares				0.0
Common stock, shares outstanding	165.3		165.3
Stockholders' Equity Attributable to Parent	$ 5,297.1		$ 41.3	$ (1.7)	79.6	5,185.8	(7.9)
Treasury Stock, Shares				0.0
Net income	399.9					399.9
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.9	0.5
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(46.1)		$ 0.2	$ (80.1)	33.8
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	42.0				42.0
Stock Repurchased During Period, Value	269.4		$ 0.4	$ 269.4	(0.4)
Stock Repurchased During Period, Shares			1.7	1.7
Dividends	(92.5)					(92.5)
Other Comprehensive Income (Loss), Net of Tax	(3.2)						3.2
Net income	973.0
Treasury Stock, Retired, Cost Method, Amount				$ 0.0
Common stock, shares outstanding			164.5
Stockholders' Equity Attributable to Parent	5,334.2		$ 41.1	$ (351.2)	155.8	5,493.2	(4.7)
Treasury Stock, Shares				2.2
Net income	305.8					305.8
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.2	0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	12.8		$ 0.0	$ (3.5)	16.3
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	45.3				45.3
Stock Repurchased During Period, Value	418.0		$ 0.7	$ 418.0	(0.7)
Stock Repurchased During Period, Shares			3.0	3.0
Dividends	(91.2)					(91.2)
Other Comprehensive Income (Loss), Net of Tax	0.3						(0.3)
Common stock, shares outstanding			161.7
Stockholders' Equity Attributable to Parent	5,188.6		$ 40.4	$ (772.7)	218.1	5,707.8	(5.0)
Treasury Stock, Shares				5.2
Net income	267.3
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.0	0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(1.0)		$ 0.0	$ (1.6)	0.6
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	48.6				48.6
Stock Repurchased During Period, Value	119.1		$ 0.3	$ 119.1	(0.3)
Stock Repurchased During Period, Shares			1.0	1.0
Dividends	(90.0)					(90.0)
Other Comprehensive Income (Loss), Net of Tax	$ (0.2)						0.2
Common stock, shares outstanding	160.7		160.7
Stockholders' Equity Attributable to Parent	$ 5,294.6		$ 40.1	$ (893.4)	$ 267.6	$ 5,885.1	$ (4.8)
Treasury Stock, Shares				6.2
Authorized amount of stock for repurchase		$ 2,000.0
Remaining amount authorized fro stock repurchase	$ 1,200.0