Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	COMMON STOCK, $1 PAR VALUE:	ADDITIONAL PAID-IN CAPITAL:	TREASURY STOCK, AT COST:	RETAINED EARNINGS:	RETAINED EARNINGS: Cumulative Effect, Period of Adoption, Adjustment	ACCUMULATED OTHER COMPREHENSIVE LOSS:
Beginning balance at Dec. 31, 2018		$ 346.6	$ 69.4		$ 9,275.4		$ (1,098.5)
Net income	$ 2,387.9				2,387.9
Purchases, shares: 2020 - .71; 2019 - 1.68; 2018 - 5.85				$ (110.2)
Cash dividends declared on common stock,per share: 2020 - $1.98; 2019 - $3.58; 2018 - $3.09					(1,242.0)
Treasury stock retirement		(1.7)	(85.7)	110.2	(22.8)
Stock compensation		1.4	77.7
Other comprehensive income (loss)	(1.6)						(1.6)
Ending balance at Dec. 31, 2019	9,706.1	346.3	61.4		10,398.5		(1,100.1)
Net income	1,298.4				1,298.4
Purchases, shares: 2020 - .71; 2019 - 1.68; 2018 - 5.85				(42.1)
Cash dividends declared on common stock,per share: 2020 - $1.98; 2019 - $3.58; 2018 - $3.09					(687.1)
Treasury stock retirement		(0.7)	(41.4)	42.1
Stock compensation		1.0	68.5
Other comprehensive income (loss)	49.8						49.8
Ending balance at Dec. 31, 2020	10,390.0	346.6	88.5		11,005.2	$ (4.6)	(1,050.3)
Net income	1,852.1				1,852.1
Purchases, shares: 2020 - .71; 2019 - 1.68; 2018 - 5.85				(1.5)
Cash dividends declared on common stock,per share: 2020 - $1.98; 2019 - $3.58; 2018 - $3.09					(988.1)
Treasury stock retirement			(1.5)	$ 1.5
Stock compensation		0.7	55.0
Other comprehensive income (loss)	129.2						129.2
Ending balance at Dec. 31, 2021	$ 11,437.4	$ 347.3	$ 142.0		$ 11,869.2		$ (921.1)