Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 by reportable segment were as follows:



In millions	December 31, 2015		Acquisitions/ divestitures		Purchase accounting adjustments			Foreign currency translation/other			December 31, 2016
Water Quality Systems	$	1,121.1	$	20.8	$	—		$	(4.8	)	$	1,137.1
Flow & Filtration Solutions	882.7		—		—			(25.2		)	857.5
Technical Solutions	2,255.2		—		(30.9		)	(1.5		)	2,222.8
Total goodwill	$	4,259.0	$	20.8	$	(30.9	)	$	(31.5	)	$	4,217.4



In millions	December 31, 2014		Acquisitions/ divestitures		Foreign currency translation/other			December 31, 2015
Water Quality Systems	$	1,137.6	$	—	$	(16.5	)	$	1,121.1
Flow & Filtration Solutions	942.4		—		(59.7		)	882.7
Technical Solutions	1,150.3		1,116.4		(11.5		)	2,255.2
Total goodwill	$	3,230.3	$	1,116.4	$	(87.7	)	$	4,259.0

Identifiable intangible assets consisted of the following at December 31:



	2016							2015
In millions	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Finite-life intangibles
Customer relationships	$	1,478.0	$	(346.7	)	$	1,131.3	$	1,482.9	$	(266.9	)	$	1,216.0
Trade names	1.8		(1.4		)	0.4		1.8		(1.2		)	0.6
Proprietary technology and patents	141.3		(100.3		)	41.0		144.1		(89.8		)	54.3
Total finite-life intangibles	1,621.1		(448.4		)	1,172.7		1,628.8		(357.9		)	1,270.9
Indefinite-life intangibles
Trade names	459.1		—			459.1		476.5		—			476.5
Total intangibles	$	2,080.2	$	(448.4	)	$	1,631.8	$	2,105.3	$	(357.9	)	$	1,747.4

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



In millions	2017		2018		2019		2020		2021
Estimated amortization expense	$	95.5	$	94.0	$	91.6	$	85.0	$	80.0