Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares	Ordinary Shares Held in Treasury and Employee Benefit Trust	Capital in Excess of Par Value of Ordinary Shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- controlling Interest
Beginning balance at Dec. 31, 2017	$ 13,367.4	$ 465.1	$ (4.8)	$ 10,483.3	$ 3,406.0	$ (1,003.7)	$ 21.5
Increase (Decrease) in Stockholders' Equity
Adoption of accounting standards	(91.4)				(91.5)		0.1
Net income (loss)	91.4				95.1		(3.7)
Other comprehensive income	13.4					11.8	1.6
Cancellation of treasury shares	(92.6)	(3.0)		(67.7)	(21.9)
Issuance of ordinary shares	0.1	0.1
Net sales of ordinary shares for employee benefit trust	0.8		0.8
Cash dividends declared ($0.13 per share)	(60.2)				(60.2)
Share-based compensation (Note 14)	12.9			12.9
Other	(2.0)			0.8			(2.8)
Ending balance at Mar. 31, 2018	$ 13,239.8	462.2	(4.0)	10,429.3	3,327.5	(991.9)	16.7
Increase (Decrease) in Stockholders' Equity
Ordinary shares, shares issued (in shares)	450.5
Beginning balance at Dec. 31, 2018	$ 10,388.9	450.5	(2.4)	10,197.0	1,072.2	(1,359.7)	31.3
Increase (Decrease) in Stockholders' Equity
Adoption of accounting standards	1.8				1.8
Net income (loss)	19.8				20.9		(1.1)
Other comprehensive income	37.4					36.7	0.7
Cancellation of treasury shares	(50.1)	$ (2.2)		(47.9)
Net sales of ordinary shares for employee benefit trust	2.4		2.4
Cash dividends declared ($0.13 per share)	(58.5)				(58.5)
Share-based compensation (Note 14)	20.4			20.4
Other	11.5				11.5
Ending balance at Mar. 31, 2019	$ 10,373.6		$ 0.0	$ 10,169.5	$ 1,047.9	$ (1,323.0)	$ 30.9
Increase (Decrease) in Stockholders' Equity
Ordinary shares, shares issued (in shares)	448.3