Goodwill and Other Identifiable Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Carrying Amount of Goodwill by Segment

The changes in the carrying amount of goodwill by segment were as follows:

In millions	December 31, 2016		Acquisitions/divestitures		Foreign currency  translation/other		September 30, 2017
Water	$	1,994.6	$	27.3	$	83.4	$	2,105.3
Electrical	2,222.8		5.3		10.2		2,238.3
Total goodwill	$	4,217.4	$	32.6	$	93.6	$	4,343.6

Detail of Identifiable Intangible Assets

Identifiable intangible assets consisted of the following:

	September 30, 2017							December 31, 2016
In millions	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Finite-life intangibles
Customer relationships	$	1,513.2	$	(415.1	)	$	1,098.1	$	1,478.0	$	(346.7	)	$	1,131.3
Trade names	1.5		(1.4		)	0.1		1.8		(1.4		)	0.4
Proprietary technology and patents	131.3		(90.8		)	40.5		141.3		(100.3		)	41.0
Total finite-life intangibles	1,646.0		(507.3		)	1,138.7		1,621.1		(448.4		)	1,172.7
Indefinite-life intangibles
Trade names	468.6		—			468.6		459.1		—			459.1
Total intangibles, net	$	2,114.6	$	(507.3	)	$	1,607.3	$	2,080.2	$	(448.4	)	$	1,631.8

Estimated Future Amortization Expense for Identifiable Intangible Assets

Estimated future amortization expense for identifiable intangible assets during the remainder of 2017 and the next five years is as follows:

	Q4
In millions	2017		2018		2019		2020		2021		2022
Estimated amortization expense	$	24.5	$	96.1	$	89.1	$	83.9	$	77.4	$	70.1