Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions		Total	Par Value	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Losses	Common Stock Issued
Beginning balance (in shares) at Dec. 31, 2018								544,003,038
Beginning balance at Dec. 31, 2018		$ 2,070.6	$ 0.1	$ 2,283.0	$ (3,563.2)	$ 3,942.6	$ (591.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		134.4				134.4
Common stock dividend	[1]	(41.0)				(41.0)
Other comprehensive income (loss)		59.6					59.6
Treasury stock acquired		(75.0)			(75.0)
Stock options exercised		11.6		8.7	2.9
Stock-based compensation		9.2		9.2
Other stock issuances		1.1		1.0	0.1
Ending balance (in shares) at Mar. 31, 2019								544,003,038
Ending balance at Mar. 31, 2019		$ 2,170.5	0.1	2,301.9	(3,635.2)	4,036.0	(532.3)
Beginning balance (in shares) at Dec. 31, 2019		544,003,038						544,003,038
Beginning balance at Dec. 31, 2019		$ 2,260.8	0.1	2,369.1	(3,849.9)	4,228.4	(486.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		171.7				171.7
Common stock dividend	[1]	(44.3)				(44.3)
Other comprehensive income (loss)		(171.8)					(171.8)
Treasury stock acquired		(173.8)			(173.8)
Stock options exercised		19.5		14.8	4.7
Stock-based compensation		19.6		19.6
Other stock issuances		$ 1.2		1.1	0.1
Ending balance (in shares) at Mar. 31, 2020		544,003,038						544,003,038
Ending balance at Mar. 31, 2020		$ 2,080.5	$ 0.1	$ 2,404.6	$ (4,018.9)	$ 4,353.4	$ (658.7)

[1] Refer to Note 10. Stockholders' Equity for discussion related to quarterly cash dividends declared per share