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:	RETAINED EARNINGS: Adjustment Cumulative Effect of Change in Accounting Principle	ACCUMULATED OTHER COMPREHENSIVE LOSS:
Beginning balance at Dec. 31, 2019			$ 346.3	$ 61.4		$ 10,398.5		$ (1,100.1)
Net income	$ 359.4					359.4
Purchases					$ (41.5)
Cash dividends declared on common stock						(111.1)
Stock compensation			0.1	12.8
Other comprehensive loss	(283.8)							(283.8)
Ending balance at Mar. 31, 2020	9,637.4		346.4	74.2	(41.5)	10,642.2	$ (4.6)	(1,383.9)
Beginning balance at Dec. 31, 2020	10,390.0	[1]	346.6	88.5		11,005.2		(1,050.3)
Net income	470.1					470.1
Purchases					(1.4)
Cash dividends declared on common stock						(111.3)
Stock compensation			0.6	35.8
Other comprehensive loss	(66.1)							(66.1)
Ending balance at Mar. 31, 2021	$ 10,717.7		$ 347.2	$ 124.3	$ (1.4)	$ 11,364.0		$ (1,116.4)

[1] The December 31, 2020 consolidated balance sheet has been derived from audited financial statements.