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, 2018			$ 346.6	$ 69.4		$ 9,275.4	$ (1,098.5)
Net income	$ 629.0					629.0
Purchases					$ (33.4)
Cash dividends declared on common stock						(111.3)
Stock compensation			0.4	24.9
Other comprehensive (loss) 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)
Beginning balance at Dec. 31, 2019	9,706.1	[1]	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)
Cumulative effect of change in accounting principle						(4.6)
Stock compensation			0.1	12.8
Other comprehensive (loss) income	(283.8)						(283.8)
Ending balance at Mar. 31, 2020	$ 9,637.4		$ 346.4	$ 74.2	$ (41.5)	$ 10,642.2	$ (1,383.9)

[1] The December 31, 2019 consolidated balance sheet has been derived from audited financial statements.