Statement of Stockholders Equity Statement - USD ($) shares in Millions, $ in Millions	Total	2019 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)		(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)
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
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)		(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
Stock repurchase program expiration date		Jan. 30, 2021
Common stock, shares outstanding	164.9		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
Authorized amount of stock for repurchase		$ 2,000.0
Remaining amount authorized fro stock repurchase		$ 780.0