Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Ordinary shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Cash dividends declared per ordinary share	$ 0.35
Beginning Balance (in shares) at Dec. 31, 2017		180.3
Beginning Balance at Dec. 31, 2017	$ 5,037.8	$ 1.8	$ 2,797.7	$ 2,481.7	$ (243.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102.9			102.9
Other comprehensive income, net of tax	(1.4)				(1.4)
Dividends declared, $0.18 per share	(62.6)			(62.6)
Share repurchase (in shares)		(2.2)
Share repurchase	(150.0)		(150.0)
Exercise of options, net of shares tendered for payment	5.8		5.8
Exercise of options, net of shares tendered for payment (in shares)		0.1
Issuance of restricted shares, net of cancellations (in shares)		0.3
Issuance of restricted shares, net of cancellations	0.0
Shares surrendered by employees to pay taxes (in shares)		(0.1)
Shares surrendered by employees to pay taxes	(4.8)		(4.8)
Share-based compensation	6.0		6.0
Ending Balance (in shares) at Mar. 31, 2018		178.4
Ending Balance at Mar. 31, 2018	4,719.7	$ 1.8	2,654.7	2,308.0	(244.8)
Beginning Balance (in shares) at Dec. 31, 2017		180.3
Beginning Balance at Dec. 31, 2017	5,037.8	$ 1.8	2,797.7	2,481.7	(243.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	254.5
Ending Balance (in shares) at Sep. 30, 2018		173.6
Ending Balance at Sep. 30, 2018	$ 1,880.2	$ 1.8	1,991.9	107.5	(221.0)
Cash dividends declared per ordinary share	$ 0.175
Beginning Balance (in shares) at Mar. 31, 2018		178.4
Beginning Balance at Mar. 31, 2018	$ 4,719.7	$ 1.8	2,654.7	2,308.0	(244.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41.5			41.5
Other comprehensive income, net of tax	74.8				74.8
Dividends declared, $0.18 per share	(30.9)			(30.9)
Share repurchase (in shares)		(3.3)
Share repurchase	(150.0)		(150.0)
Exercise of options, net of shares tendered for payment	6.3		6.3
Exercise of options, net of shares tendered for payment (in shares)		0.3
Issuance of restricted shares, net of cancellations (in shares)		(0.1)
Issuance of restricted shares, net of cancellations	0.0	$ 0.0
Shares surrendered by employees to pay taxes (in shares)		0.1
Shares surrendered by employees to pay taxes	(1.0)		(1.0)
Distribution to nVent	(2,776.8)		(438.2)	(2,290.7)	(47.9)
Share-based compensation	5.3		5.3
Ending Balance (in shares) at Jun. 30, 2018		175.4
Ending Balance at Jun. 30, 2018	$ 1,888.9	$ 1.8	2,077.1	27.9	(217.9)
Cash dividends declared per ordinary share	$ 0.175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 110.1			110.1
Other comprehensive income, net of tax	(3.1)				(3.1)
Dividends declared, $0.18 per share	(30.5)			(30.5)
Share repurchase (in shares)		(2.3)
Share repurchase	(100.0)		(100.0)
Exercise of options, net of shares tendered for payment	10.7		10.7
Exercise of options, net of shares tendered for payment (in shares)		0.4
Issuance of restricted shares, net of cancellations (in shares)		0.1
Issuance of restricted shares, net of cancellations	0.0
Shares surrendered by employees to pay taxes	(1.0)		(1.0)
Share-based compensation	5.1		5.1
Ending Balance (in shares) at Sep. 30, 2018		173.6
Ending Balance at Sep. 30, 2018	$ 1,880.2	$ 1.8	1,991.9	107.5	(221.0)
Cash dividends declared per ordinary share	$ 0.18
Beginning Balance (in shares) at Dec. 31, 2018		171.4
Beginning Balance at Dec. 31, 2018	$ 1,836.1	$ 1.7	1,893.8	169.2	(228.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51.3			51.3
Other comprehensive income, net of tax	2.7				2.7
Dividends declared, $0.18 per share	(31.0)			(31.0)
Exercise of options, net of shares tendered for payment	9.1		9.1
Exercise of options, net of shares tendered for payment (in shares)		0.3
Issuance of restricted shares, net of cancellations (in shares)		0.2
Issuance of restricted shares, net of cancellations	0.0	$ 0.0
Shares surrendered by employees to pay taxes (in shares)		0.0
Shares surrendered by employees to pay taxes	(3.2)		(3.2)
Share-based compensation	5.4		5.4
Ending Balance (in shares) at Mar. 31, 2019		171.9
Ending Balance at Mar. 31, 2019	1,870.4	$ 1.7	1,905.1	189.5	(225.9)
Beginning Balance (in shares) at Dec. 31, 2018		171.4
Beginning Balance at Dec. 31, 2018	1,836.1	$ 1.7	1,893.8	169.2	(228.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	257.9
Ending Balance (in shares) at Sep. 30, 2019		168.1
Ending Balance at Sep. 30, 2019	$ 1,868.8	$ 1.7	1,765.9	335.3	(234.1)
Cash dividends declared per ordinary share	$ 0.18
Beginning Balance (in shares) at Mar. 31, 2019		171.9
Beginning Balance at Mar. 31, 2019	$ 1,870.4	$ 1.7	1,905.1	189.5	(225.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	114.3			114.3
Other comprehensive income, net of tax	(4.3)				(4.3)
Dividends declared, $0.18 per share	(30.4)			(30.4)
Share repurchase (in shares)		(4.0)
Share repurchase	(150.0)		(150.0)
Exercise of options, net of shares tendered for payment	2.2		2.2
Exercise of options, net of shares tendered for payment (in shares)		0.1
Issuance of restricted shares, net of cancellations (in shares)		0.1
Issuance of restricted shares, net of cancellations	0.0	$ 0.0
Shares surrendered by employees to pay taxes (in shares)		(0.1)
Shares surrendered by employees to pay taxes	(0.9)		(0.9)
Share-based compensation	5.3		5.3
Ending Balance (in shares) at Jun. 30, 2019		168.0
Ending Balance at Jun. 30, 2019	$ 1,806.6	$ 1.7	1,761.7	273.4	(230.2)
Cash dividends declared per ordinary share	$ 0.18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 92.3			92.3
Other comprehensive income, net of tax	(3.9)				(3.9)
Dividends declared, $0.18 per share	(30.4)			(30.4)
Exercise of options, net of shares tendered for payment	0.0		0.0
Exercise of options, net of shares tendered for payment (in shares)		0.1
Shares surrendered by employees to pay taxes (in shares)		0.0
Shares surrendered by employees to pay taxes	(0.4)		(0.4)
Share-based compensation	4.6		4.6
Ending Balance (in shares) at Sep. 30, 2019		168.1
Ending Balance at Sep. 30, 2019	$ 1,868.8	$ 1.7	$ 1,765.9	$ 335.3	$ (234.1)