Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 by reportable segment were as follows:



In millions	December 31, 2016		Acquisitions/ divestitures		Foreign currency translation/other		December 31, 2017
Water	$	1,994.6	$	27.3	$	91.0	$	2,112.9
Electrical	2,222.8		5.3		10.1		2,238.2
Total goodwill	$	4,217.4	$	32.6	$	101.1	$	4,351.1



In millions	December 31, 2015		Acquisitions/ divestitures		Purchase accounting adjustments			Foreign currency translation/other			December 31, 2016
Water	$	2,003.8	$	20.8	$	—		$	(30.0	)	$	1,994.6
Electrical	2,255.2		—		(30.9		)	(1.5		)	2,222.8
Total goodwill	$	4,259.0	$	20.8	$	(30.9	)	$	(31.5	)	$	4,217.4

Identifiable intangible assets consisted of the following at December 31:



	2017							2016
In millions	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Definite-life intangibles
Customer relationships	$	1,513.9	$	(437.5	)	$	1,076.4	$	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	131.9		(94.2		)	37.7		141.3		(100.3		)	41.0
Total finite-life intangibles	1,647.3		(533.1		)	1,114.2		1,621.1		(448.4		)	1,172.7
Indefinite-life intangibles
Trade names	444.2		—			444.2		459.1		—			459.1
Total intangibles	$	2,091.5	$	(533.1	)	$	1,558.4	$	2,080.2	$	(448.4	)	$	1,631.8

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



In millions	2018		2019		2020		2021		2022
Estimated amortization expense	$	96.3	$	89.2	$	84.0	$	77.5	$	70.0