Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total		COMMON STOCK, $1 PAR VALUE:	ADDITIONAL PAID-IN CAPITAL:	TREASURY STOCK, AT COST:	RETAINED EARNINGS:	ACCUMULATED OTHER COMPREHENSIVE LOSS:
Beginning balance at Dec. 31, 2017			$ 351.8	$ 123.2		$ 8,369.1	$ (793.6)
Net income	$ 512.1					512.1
Purchases, shares: 2019 - .50; 2018 - .26					$ (16.7)
Cash dividends declared on common stock,per share: 2019 - $.32, 2018 - $.25						(88.2)
Cumulative effect of change in accounting principles						17.1
Stock compensation			0.3	16.9
Other comprehensive income	75.3						75.3
Ending balance at Mar. 31, 2018	8,567.3		352.1	140.1	(16.7)	8,810.1	(718.3)
Beginning balance at Dec. 31, 2018	8,592.9	[1]	346.6	69.4		9,275.4	(1,098.5)
Net income	629.0					629.0
Purchases, shares: 2019 - .50; 2018 - .26					(33.4)
Cash dividends declared on common stock,per share: 2019 - $.32, 2018 - $.25						(111.3)
Stock compensation			0.4	24.9
Other comprehensive income	3.0						3.0
Ending balance at Mar. 31, 2019	$ 9,105.5		$ 347.0	$ 94.3	$ (33.4)	$ 9,793.1	$ (1,095.5)

[1] The December 31, 2018 consolidated balance sheet has been derived from audited financial statements.