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
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
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
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		(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
Common stock, shares outstanding	164.5		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
Authorized amount of stock for repurchase		$ 2,000.0
Remaining amount authorized fro stock repurchase	$ 1,700.0