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)	(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, 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)	(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)