Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares Issued	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit)	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Accumulated Other Comprehensive Income	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings (Accumulated Deficit)
Balance, shares at Dec. 31, 2018		135.9
Balance at Dec. 31, 2018	$ 5,668.0	$ 7,421.7	$ 84.6	$ (1,838.3)	$ (3.3)	$ 0.0	$ (3.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	146.1			146.1
Other comprehensive income (loss)	54.8		54.8
Issuance of ordinary shares under:
Stock options	0.9	$ 0.9
Restricted stock plan, shares		0.3
Compensation for stock options	4.7	$ 4.7
Compensation for restricted stock	50.6	50.6
Cash dividends	(112.4)	$ (112.4)
Shares withheld for payment of employees' withholding tax liability, shares		(0.1)
Shares withheld for payment of employees' withholding tax liability	(5.6)	$ (5.6)
Repurchases of ordinary shares, shares		0.0
Balance, shares at Dec. 31, 2019		136.1
Balance at Dec. 31, 2019	5,803.8	$ 7,359.9	139.4	(1,695.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(162.6)			(162.6)
Other comprehensive income (loss)	255.6		255.6
Issuance of ordinary shares under:
Restricted stock plan, shares		0.6
Compensation for stock options	2.0	$ 2.0
Compensation for restricted stock	56.5	56.5
Cash dividends	(123.9)	$ (123.9)
Shares withheld for payment of employees' withholding tax liability, shares		(0.2)
Shares withheld for payment of employees' withholding tax liability	(10.7)	$ (10.7)
Repurchases of ordinary shares, shares		(3.4)
Repurchases of ordinary shares	(164.2)	$ (164.2)
Purchase of subsidiary's minority interest	(1.4)	$ (1.4)
Balance, shares at Dec. 31, 2020		133.1
Balance at Dec. 31, 2020	5,655.1	$ 7,118.2	395.0	(1,858.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(68.9)			(68.9)
Other comprehensive income (loss)	(359.5)		(359.5)
Issuance of ordinary shares under:
Restricted stock plan, shares		1.0
Compensation for stock options	0.9	$ 0.9
Compensation for restricted stock	66.9	66.9
Cash dividends	(129.6)	$ (129.6)
Shares withheld for payment of employees' withholding tax liability, shares		(0.3)
Shares withheld for payment of employees' withholding tax liability	(13.2)	$ (13.2)
Balance, shares at Dec. 31, 2021		133.8
Balance at Dec. 31, 2021	$ 5,151.7	$ 7,043.2	$ 35.5	$ (1,927.0)