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			170.1
Stockholders' Equity Attributable to Parent	$ 4,122.3		$ 42.5	$ (3,412.9)	$ 3,188.0	$ 4,312.6	$ (7.9)
Treasury Stock, Shares				60.1
Net income	257.1					257.1
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			1.1	0.3
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	8.2		$ 0.3	$ (26.7)	34.6
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	29.1				29.1
Treasury Stock, Shares, Acquired			(0.7)
Treasury Stock, Value, Acquired, Par Value Method	(74.2)		$ (0.2)	$ (74.2)	0.2
Stock Repurchased During Period, Shares				0.7
Dividends	(75.1)					(75.1)
Other Comprehensive Income (Loss), Net of Tax	0.1						(0.1)
Net income	$ 438.1
Treasury Stock, Shares, Acquired	(4.0)
Treasury Stock, Value, Acquired, Par Value Method	$ (358.0)
Common stock, shares outstanding			170.5
Stockholders' Equity Attributable to Parent	4,267.3		$ 42.6	$ (3,513.8)	3,251.9	4,494.6	(8.0)
Treasury Stock, Shares				61.1
Net income	181.1					181.1
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.3	0.0
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	18.5		$ 0.1	$ (2.0)	20.4
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 34.1				34.1
Treasury Stock, Shares, Acquired	(3.2)		(3.2)
Treasury Stock, Value, Acquired, Par Value Method	$ (283.8)		$ (0.8)	$ (283.8)	0.8
Stock Repurchased During Period, Shares				3.2
Dividends	(74.9)					(74.9)
Other Comprehensive Income (Loss), Net of Tax	(0.5)						0.5
Common stock, shares outstanding			167.6
Stockholders' Equity Attributable to Parent	$ 4,142.8		$ 41.9	$ (3,799.6)	3,307.2	4,600.8	(7.5)
Treasury Stock, Shares				64.3
Common stock, shares outstanding	165.6		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
StockIssuedDuringPeriodSharesShareBasedCompensationNetofRelatedTaxes(inshares)			0.7	0.4
StockIssuedDuringPeriodValueShareBasedCompensationNetofRelatedTaxes	(45.0)		$ 0.2	$ (47.8)	2.6
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	64.9				64.9
Treasury Stock, Shares, Acquired			(1.4)
Treasury Stock, Value, Acquired, Par Value Method	(195.6)		$ (0.4)		0.4
Stock Repurchased During Period, Shares				1.4
Dividends	(83.0)					(83.0)
Other Comprehensive Income (Loss), Net of Tax	(0.1)						0.1
Net income	$ 834.3
Treasury Stock, Shares, Acquired	(1.4)
Treasury Stock, Value, Acquired, Par Value Method	$ (195.6)
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
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
Treasury Stock, Shares, Acquired			0.0
Treasury Stock, Value, Acquired, Par Value Method	0.0		$ 0.0
Stock Repurchased During Period, Shares				0.0
Dividends	(82.6)					(82.6)
Other Comprehensive Income (Loss), Net of Tax	$ 0.1						(0.1)
Common stock, shares outstanding	165.1		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
Remaining amount authorized fro stock repurchase		$ 2,000.0