Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Ordinary Shares Issued	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit)
Balance, shares at Dec. 31, 2019		136,100,000
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		600,000
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		(200,000)
Shares withheld for payment of employees' withholding tax liability	(10.7)	$ (10.7)
Repurchases of ordinary shares, shares		(3,400,000)
Repurchases of ordinary shares	(164.2)	$ (164.2)
Purchase of subsidiary's minority interest	(1.4)
Balance, shares at Dec. 31, 2020		133,100,000
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		1,000,000.0
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		(300,000)
Shares withheld for payment of employees' withholding tax liability	$ (13.2)	$ (13.2)
Repurchases of ordinary shares, shares	0
Balance, shares at Dec. 31, 2021		133,800,000
Balance at Dec. 31, 2021	$ 5,151.7	$ 7,043.2	35.5	(1,927.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(140.6)			(140.6)
Other comprehensive income (loss)	(62.5)		(62.5)
Issuance of ordinary shares under:
Restricted stock plan, shares		1,400,000
Compensation for restricted stock	54.9	$ 54.9
Cash dividends	(142.4)	$ (142.4)
Shares withheld for payment of employees' withholding tax liability, shares		(500,000)
Shares withheld for payment of employees' withholding tax liability	$ (19.0)	$ (19.0)
Repurchases of ordinary shares, shares	0
Balance, shares at Dec. 31, 2022		134,700,000
Balance at Dec. 31, 2022	$ 4,842.1	$ 6,936.7	$ (27.0)	$ (2,067.6)