Statements of Consolidated Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Other Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2016	$ 1,878.4	$ 116.6	$ 2,488.5	$ 4,049.5	$ (4,235.8)	$ (540.4)
Shareholders' Equity [Roll Forward]
Net income	1,727.9			1,727.9
Other comprehensive income (loss)	155.5					155.5
Stock-based compensation activity	202.8	1.0	232.4		(30.6)
Other adjustments	2.3		2.3
Cash dividends	(319.0)			(319.0)
Ending balance at Dec. 31, 2017	3,647.9	117.6	2,723.2	5,458.4	(4,266.4)	(384.9)
Shareholders' Equity [Roll Forward]
Net income	1,108.7			1,108.7
Other comprehensive income (loss)	(242.7)					(242.7)
Treasury stock purchased	(613.3)				(613.3)
Stock-based compensation activity	152.2	0.8	172.4		(21.0)
Other adjustments	0.8		0.8
Cash dividends	(322.9)			(322.9)
Ending balance at Dec. 31, 2018	3,730.7	118.4	2,896.4	6,246.5	(4,900.7)	(629.9)
Shareholders' Equity [Roll Forward]
Net income	1,541.3			1,541.3
Other comprehensive income (loss)	(41.3)					(41.3)
Treasury stock purchased	(778.8)				(778.8)
Stock-based compensation activity	230.3	1.0	254.5		(25.2)
Treasury stock transferred from defined benefit pension plan	(131.8)				(131.8)
Other adjustments	2.1		2.1
Cash dividends	(420.8)			(420.8)
Ending balance at Dec. 31, 2019	$ 4,123.3	$ 119.4	$ 3,153.0	$ 7,366.9	$ (5,836.5)	$ (679.5)