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)	Total Pentair plc
Balance (in shares) at Dec. 31, 2016		181.8
Beginning Balance at Dec. 31, 2016	$ 4,254.4	$ 1.8	$ 2,920.8	$ 2,068.1	$ (736.3)
Net income	666.5			666.5
Net income	666.5
Other comprehensive income, net of tax	492.9				492.9
Dividends declared	(252.9)		0.0	(252.9)
Share repurchase (in shares)		(3.0)
Share repurchases	$ (200.0)		(200.0)
Exercise of options, net of shares tendered for payment (in shares)	1.2
Exercise of options, net of shares tendered for payment	$ 45.6		45.6
Issuance of restricted shares, net of cancellations (in shares)	0.4
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	(8.3)		(8.3)
Share-based compensation	39.6		39.6
Balance (in shares) at Dec. 31, 2017		180.3
Ending Balance at Dec. 31, 2017	5,037.8	$ 1.8	2,797.7	2,481.7	(243.4)
Net income	347.4			347.4
Net income	347.4
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)		0.0	(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		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)
Cumulative Effect of New Accounting Principle in Period of Adoption				(214.0)		$ (214.0)
Net income	355.7			355.7
Net income	355.7					355.7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent					2.1	$ 2.1
Dividends declared	(123.9)			(123.9)
Share repurchase (in shares)		(4.0)
Share repurchases	$ (150.0)	$ 0.0	(150.0)
Exercise of options, net of shares tendered for payment (in shares)	0.6	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		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)