Goodwill and Other Identifiable Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2017

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



In millions	December 31, 2016		Acquisitions/divestitures		Foreign currency translation/other		March 31, 2017
Water	$	1,994.6	$	45.3	$	24.7	$	2,064.6
Electrical	2,222.8		5.3		2.6		2,230.7
Total goodwill	$	4,217.4	$	50.6	$	27.3	$	4,295.3

Identifiable intangible assets consisted of the following:



	March 31, 2017							December 31, 2016
In millions	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Finite-life intangibles
Customer relationships	$	1,482.4	$	(366.8	)	$	1,115.6	$	1,478.0	$	(346.7	)	$	1,131.3
Trade names	1.9		(1.5		)	0.4		1.8		(1.4		)	0.4
Proprietary technology and patents	139.8		(95.5		)	44.3		141.3		(100.3		)	41.0
Total finite-life intangibles	1,624.1		(463.8		)	1,160.3		1,621.1		(448.4		)	1,172.7
Indefinite-life intangibles
Trade names	462.2		—			462.2		459.1		—			459.1
Total intangibles, net	$	2,086.3	$	(463.8	)	$	1,622.5	$	2,080.2	$	(448.4	)	$	1,631.8

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



	Q2-Q4
In millions	2017		2018		2019		2020		2021		2022
Estimated amortization expense	$	72.4	$	95.4	$	92.9	$	86.1	$	81.1	$	74.9