Condensed Consolidated and Combined Statements of Changes in Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Ordinary shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2018		177.2
Beginning balance at Dec. 31, 2018	$ 2,687.1	$ 1.8	$ 2,709.7	$ 83.4	$ (107.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56.4			56.4
Other comprehensive income (loss), net of tax	(3.2)				(3.2)
Dividends declared	(30.6)			(30.6)
Share repurchases (in shares)		(3.0)
Share repurchases	(79.9)	$ (0.1)	(79.8)
Exercise of options, net of shares tendered for payment (in shares)		0.3
Exercise of options, net of shares tendered for payment	$ 3.6		3.6
Issuance of restricted shares, net of cancellations	0.0	0.3
Shares surrendered by employees to pay taxes	$ (2.6)	$ (0.1)	(2.6)
Share-based compensation	4.3		4.3
Ending balance (in shares) at Mar. 31, 2019		174.7
Ending balance at Mar. 31, 2019	2,635.1	$ 1.7	2,635.2	109.2	(111.0)
Beginning balance (in shares) at Dec. 31, 2018		177.2
Beginning balance at Dec. 31, 2018	2,687.1	$ 1.8	2,709.7	83.4	(107.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 117.3
Share repurchases (in shares)	(9.0)
Share repurchases	$ (232.7)
Ending balance (in shares) at Jun. 30, 2019		169.1
Ending balance at Jun. 30, 2019	2,537.8	$ 1.7	2,490.7	140.5	(95.1)
Beginning balance (in shares) at Mar. 31, 2019		174.7
Beginning balance at Mar. 31, 2019	2,635.1	$ 1.7	2,635.2	109.2	(111.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60.9			60.9
Other comprehensive income (loss), net of tax	15.9				15.9
Dividends declared	(29.6)			(29.6)
Share repurchases (in shares)		(5.9)
Share repurchases	(152.8)	$ 0.0	(152.8)
Exercise of options, net of shares tendered for payment (in shares)		0.3
Exercise of options, net of shares tendered for payment	4.8		4.8
Shares surrendered by employees to pay taxes	(0.6)	$ 0.0	(0.6)
Share-based compensation	4.1		4.1
Ending balance (in shares) at Jun. 30, 2019		169.1
Ending balance at Jun. 30, 2019	2,537.8	$ 1.7	2,490.7	140.5	(95.1)
Beginning balance (in shares) at Dec. 31, 2019		169.5
Beginning balance at Dec. 31, 2019	2,592.5	$ 1.7	2,502.7	186.7	(98.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18.6			18.6
Other comprehensive income (loss), net of tax	(6.5)				(6.5)
Dividends declared	(29.8)			(29.8)
Share repurchases (in shares)		(0.2)
Share repurchases	(3.2)	$ 0.0	(3.2)
Exercise of options, net of shares tendered for payment (in shares)		0.3
Exercise of options, net of shares tendered for payment	$ 6.4		6.4
Issuance of restricted shares, net of cancellations	0.0	0.3
Shares surrendered by employees to pay taxes	$ (3.3)	$ (0.1)	(3.3)
Share-based compensation	1.9		1.9
Ending balance (in shares) at Mar. 31, 2020		169.8
Ending balance at Mar. 31, 2020	2,576.6	$ 1.7	2,504.5	175.5	(105.1)
Beginning balance (in shares) at Dec. 31, 2019		169.5
Beginning balance at Dec. 31, 2019	2,592.5	$ 1.7	2,502.7	186.7	(98.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 44.4
Share repurchases (in shares)	(0.2)
Share repurchases	$ (3.2)
Ending balance (in shares) at Jun. 30, 2020		169.9
Ending balance at Jun. 30, 2020	2,578.2	$ 1.7	2,508.3	171.5	(103.3)
Beginning balance (in shares) at Mar. 31, 2020		169.8
Beginning balance at Mar. 31, 2020	2,576.6	$ 1.7	2,504.5	175.5	(105.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25.8			25.8
Other comprehensive income (loss), net of tax	1.8				1.8
Dividends declared	(29.8)			(29.8)
Exercise of options, net of shares tendered for payment (in shares)		0.0
Exercise of options, net of shares tendered for payment	0.2		0.2
Shares surrendered by employees to pay taxes	(0.6)	$ 0.0	(0.6)
Share-based compensation	4.2		4.2
Ending balance (in shares) at Jun. 30, 2020		169.9
Ending balance at Jun. 30, 2020	$ 2,578.2	$ 1.7	$ 2,508.3	$ 171.5	$ (103.3)