Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares Issued	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standards | Adoption of new accounting standards	$ 5.3		$ (1.0)	$ 6.3
Beginning balance (shares) at Dec. 31, 2017		140.8
Balance, beginning at Dec. 31, 2017	6,170.5	$ 7,892.9	253.1	(1,975.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	80.8			80.8
Other comprehensive income (loss)	72.2		72.2
Stock options exercised	0.2	$ 0.2
Restricted stock plan (shares)		0.2
Compensation for stock options	2.7	$ 2.7
Compensation for restricted stock	10.0	10.0
Cash dividends, $0.19 per share	(26.7)	(26.7)
Shares withheld for payment of employees' withholding tax liability	(1.5)	$ (1.5)
Repurchases of ordinary shares (shares)		(1.3)
Repurchases of ordinary shares	(108.1)	$ (108.1)
Ending balance (shares) at Mar. 31, 2018		139.7
Balance, ending at Mar. 31, 2018	6,205.4	$ 7,769.5	324.3	(1,888.4)
Beginning balance (shares) at Dec. 31, 2017		140.8
Balance, beginning at Dec. 31, 2017	6,170.5	$ 7,892.9	253.1	(1,975.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	49.6
Other comprehensive income (loss)	(108.9)
Repurchases of ordinary shares (shares)		(5.1)
Ending balance (shares) at Sep. 29, 2018		135.9
Balance, ending at Sep. 29, 2018	5,659.8	$ 7,436.3	143.2	(1,919.7)
Beginning balance (shares) at Mar. 31, 2018		139.7
Balance, beginning at Mar. 31, 2018	6,205.4	$ 7,769.5	324.3	(1,888.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	36.2			36.2
Other comprehensive income (loss)	(169.3)		(169.3)
Stock options exercised	0.1	$ 0.1
Restricted stock plan (shares)		0.1
Compensation for stock options	2.7	$ 2.7
Compensation for restricted stock	6.9	6.9
Cash dividends, $0.19 per share	(26.1)	$ (26.1)
Shares withheld for payment of employees' withholding tax liability (shares)		(0.1)
Shares withheld for payment of employees' withholding tax liability	(1.9)	$ (1.9)
Repurchases of ordinary shares (shares)		(2.0)
Repurchases of ordinary shares	(156.9)	$ (156.9)
Ending balance (shares) at Jun. 30, 2018		137.7
Balance, ending at Jun. 30, 2018	5,897.1	$ 7,594.3	155.0	(1,852.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(67.5)			(67.5)
Other comprehensive income (loss)	(11.8)		(11.8)
Stock options exercised (shares)		0.1
Stock options exercised	0.5	$ 0.5
Restricted stock plan (shares)		(0.1)
Compensation for stock options	0.5	$ 0.5
Compensation for restricted stock	3.8	3.8
Cash dividends, $0.19 per share	(25.9)	(25.9)
Shares withheld for payment of employees' withholding tax liability	(1.9)	$ (1.9)
Repurchases of ordinary shares (shares)		(1.8)
Repurchases of ordinary shares	(135.0)	$ (135.0)
Ending balance (shares) at Sep. 29, 2018		135.9
Balance, ending at Sep. 29, 2018	5,659.8	$ 7,436.3	143.2	(1,919.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting standards | Adoption of new accounting standards	(3.4)			(3.4)
Beginning balance (shares) at Dec. 31, 2018		135.9
Balance, beginning at Dec. 31, 2018	5,668.0	$ 7,421.7	84.6	(1,838.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	63.9			63.9
Other comprehensive income (loss)	(15.6)		(15.6)
Restricted stock plan (shares)		0.2
Compensation for stock options	1.8	$ 1.8
Compensation for restricted stock	14.2	14.2
Cash dividends, $0.19 per share	(25.9)	$ (25.9)
Shares withheld for payment of employees' withholding tax liability (shares)		(0.1)
Shares withheld for payment of employees' withholding tax liability	(2.4)	$ (2.4)
Ending balance (shares) at Mar. 30, 2019		136.0
Balance, ending at Mar. 30, 2019	5,700.6	$ 7,409.4	69.0	(1,777.8)
Beginning balance (shares) at Dec. 31, 2018		135.9
Balance, beginning at Dec. 31, 2018	5,668.0	$ 7,421.7	84.6	(1,838.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	165.1
Other comprehensive income (loss)	$ (28.0)		(28.0)
Repurchases of ordinary shares (shares)	0.0
Ending balance (shares) at Sep. 28, 2019		136.1
Balance, ending at Sep. 28, 2019	$ 5,758.8	$ 7,378.8	56.6	(1,676.6)
Beginning balance (shares) at Mar. 30, 2019		136.0
Balance, beginning at Mar. 30, 2019	5,700.6	$ 7,409.4	69.0	(1,777.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	9.0			9.0
Other comprehensive income (loss)	30.5		30.5
Stock options exercised	0.3	0.3
Compensation for stock options	1.3	1.3
Compensation for restricted stock	14.2	14.2
Cash dividends, $0.19 per share	(28.9)	(28.9)
Shares withheld for payment of employees' withholding tax liability	(0.8)	$ (0.8)
Ending balance (shares) at Jun. 29, 2019		136.0
Balance, ending at Jun. 29, 2019	5,726.2	$ 7,395.5	99.5	(1,768.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	92.2			92.2
Other comprehensive income (loss)	(42.9)		(42.9)
Stock options exercised	0.4	$ 0.4
Restricted stock plan (shares)		0.1
Compensation for stock options	0.9	$ 0.9
Compensation for restricted stock	11.9	11.9
Cash dividends, $0.19 per share	(28.8)	(28.8)
Shares withheld for payment of employees' withholding tax liability	$ (1.1)	$ (1.1)
Repurchases of ordinary shares (shares)	0.0
Ending balance (shares) at Sep. 28, 2019		136.1
Balance, ending at Sep. 28, 2019	$ 5,758.8	$ 7,378.8	$ 56.6	$ (1,676.6)