Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Ordinary Shares	Additional Paid-In Capital	Treasury Shares	Total	Retained Earnings	Total
Balance at beginning of period at Dec. 31, 2020	$ 0.5	$ 579.6	$ (542.9)	$ (186.1)	$ 739.2	$ 590.3
Balance at beginning of period, shares at Dec. 31, 2020	38.4
Balance at beginning of period, Treasury shares at Dec. 31, 2020			10.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					71.5	71.5
Other comprehensive income				6.1		6.1
Share-based compensation activity		(1.1)	$ 12.9			11.8
Share-based compensation activity, shares	0.3		(0.3)
Dividends on ordinary shares					(3.4)	(3.4)
Balance at end of period at Mar. 31, 2021	$ 0.5	578.5	$ (530.0)	(180.0)	807.3	676.3
Balance at end of period, shares at Mar. 31, 2021	38.7
Balance at end of period, Treasury shares at Mar. 31, 2021			10.1
Balance at beginning of period at Dec. 31, 2020	$ 0.5	579.6	$ (542.9)	(186.1)	739.2	590.3
Balance at beginning of period, shares at Dec. 31, 2020	38.4
Balance at beginning of period, Treasury shares at Dec. 31, 2020			10.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						316.2
Other comprehensive income						13.8
Balance at end of period at Sep. 30, 2021	$ 0.5	582.2	$ (524.8)	(172.3)	1,036.4	922.0
Balance at end of period, shares at Sep. 30, 2021	38.8
Balance at end of period, Treasury shares at Sep. 30, 2021			10.0
Balance at beginning of period at Mar. 31, 2021	$ 0.5	578.5	$ (530.0)	(180.0)	807.3	676.3
Balance at beginning of period, shares at Mar. 31, 2021	38.7
Balance at beginning of period, Treasury shares at Mar. 31, 2021			10.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					151.6	151.6
Other comprehensive income				0.1		0.1
Share-based compensation activity		0.2	$ 4.7			4.9
Share-based compensation activity, shares	0.1		(0.1)
Dividends on ordinary shares					(3.1)	(3.1)
Balance at end of period at Jun. 30, 2021	$ 0.5	578.7	$ (525.3)	(179.9)	955.8	829.8
Balance at end of period, shares at Jun. 30, 2021	38.8
Balance at end of period, Treasury shares at Jun. 30, 2021			10.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					93.1	93.1
Other comprehensive income				7.6		7.6
Share-based compensation activity		3.5	$ 0.5			4.0
Dividends on ordinary shares					(12.5)	(12.5)
Balance at end of period at Sep. 30, 2021	$ 0.5	582.2	$ (524.8)	(172.3)	1,036.4	922.0
Balance at end of period, shares at Sep. 30, 2021	38.8
Balance at end of period, Treasury shares at Sep. 30, 2021			10.0
Balance at beginning of period at Dec. 31, 2021	$ 0.4	468.1	$ (50.0)	(147.2)	741.8	$ 1,013.1
Balance at beginning of period, shares at Dec. 31, 2021	37.9					37.9
Balance at beginning of period, Treasury shares at Dec. 31, 2021			1.0			1.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					16.7	$ 16.7
Other comprehensive income				(2.5)		(2.5)
Share-based compensation activity		7.6				7.6
Share-based compensation activity, shares	0.2
Purchase of treasury shares			$ (50.0)			(50.0)
Purchase of treasury shares, shares	(0.9)		0.9
Dividends on ordinary shares					(12.1)	(12.1)
Balance at end of period at Mar. 31, 2022	$ 0.4	475.7	$ (100.0)	(149.7)	746.4	972.8
Balance at end of period, shares at Mar. 31, 2022	37.2
Balance at end of period, Treasury shares at Mar. 31, 2022			1.9
Balance at beginning of period at Dec. 31, 2021	$ 0.4	468.1	$ (50.0)	(147.2)	741.8	$ 1,013.1
Balance at beginning of period, shares at Dec. 31, 2021	37.9					37.9
Balance at beginning of period, Treasury shares at Dec. 31, 2021			1.0			1.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						$ (65.6)
Other comprehensive income						(79.8)
Balance at end of period at Sep. 30, 2022	$ 0.4	483.7	$ (200.0)	(227.0)	641.0	$ 698.1
Balance at end of period, shares at Sep. 30, 2022	35.1					35.1
Balance at end of period, Treasury shares at Sep. 30, 2022			4.1			4.1
Balance at beginning of period at Mar. 31, 2022	$ 0.4	475.7	$ (100.0)	(149.7)	746.4	$ 972.8
Balance at beginning of period, shares at Mar. 31, 2022	37.2
Balance at beginning of period, Treasury shares at Mar. 31, 2022			1.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					37.4	37.4
Other comprehensive income				(28.2)		(28.2)
Share-based compensation activity		4.4				4.4
Share-based compensation activity, shares	0.1
Purchase of treasury shares			$ (50.0)			(50.0)
Purchase of treasury shares, shares	(1.0)		1.0
Dividends on ordinary shares					(11.8)	(11.8)
Balance at end of period at Jun. 30, 2022	$ 0.4	480.1	$ (150.0)	(177.9)	772.0	924.6
Balance at end of period, shares at Jun. 30, 2022	36.3
Balance at end of period, Treasury shares at Jun. 30, 2022			2.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					(119.8)	(119.8)
Other comprehensive income				(49.1)		(49.1)
Share-based compensation activity		3.6				3.6
Purchase of treasury shares			$ (50.0)			(50.0)
Purchase of treasury shares, shares	(1.2)		1.2
Dividends on ordinary shares					(11.2)	(11.2)
Balance at end of period at Sep. 30, 2022	$ 0.4	$ 483.7	$ (200.0)	$ (227.0)	$ 641.0	$ 698.1
Balance at end of period, shares at Sep. 30, 2022	35.1					35.1
Balance at end of period, Treasury shares at Sep. 30, 2022			4.1			4.1