Consolidated Statements Of Changes In Equity - USD ($) shares in Millions, $ in Millions	Total	Common shares	Capital contribution reserve	Retained earnings	Accumulated other comprehensive income (loss)
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)
Net income	347.4			347.4
Cumulative Effect of New Accounting Principle in Period of Adoption	(214.0)			(214.0)
Other comprehensive income, net of tax	62.6				62.6
Distribution to nVent	2,777.0		(438.2)	(2,291.0)	47.8
Dividends declared	(154.9)			(154.9)
Share repurchase (in shares)		(10.2)
Share repurchases	$ (500.0)	$ (0.1)	(499.9)
Exercise of options, net of shares tendered for payment (in shares)	0.9
Exercise of options, net of shares tendered for payment	$ 24.3		24.3
Issuance of restricted shares, net of cancellations (in shares)	0.5
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	(11.0)		(11.0)
Share-based compensation	20.9		20.9
Balance (in shares) at Dec. 31, 2018		171.4
Ending Balance at Dec. 31, 2018	1,836.1	$ 1.7	1,893.8	169.2	(228.6)
Net income	355.7			355.7
Other comprehensive income, net of tax	2.1				2.1
Dividends declared	(123.9)			(123.9)
Share repurchase (in shares)		(4.0)
Share repurchases	(150.0)		(150.0)
Exercise of options, net of shares tendered for payment (in shares)		0.7
Exercise of options, net of shares tendered for payment	17.1		17.1
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	(4.6)		(4.6)
Share-based compensation	21.4		21.4
Balance (in shares) at Dec. 31, 2019		168.3
Ending Balance at Dec. 31, 2019	1,953.9	$ 1.7	1,777.7	401.0	(226.5)
Net income	358.6			358.6
Other comprehensive income, net of tax	19.2				19.2
Dividends declared	(128.4)			(128.4)
Share repurchase (in shares)		(3.7)
Share repurchases	$ (150.2)		(150.2)
Exercise of options, net of shares tendered for payment (in shares)	1.1	1.3
Exercise of options, net of shares tendered for payment	$ 37.6		37.6
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	(4.7)		(4.7)
Share-based compensation	20.3		20.3
Balance (in shares) at Dec. 31, 2020		166.1
Ending Balance at Dec. 31, 2020	$ 2,106.3	$ 1.7	$ 1,680.7	$ 631.2	$ (207.3)