Goodwill and Other Identifiable Intangible Assets (Tables)

6 Months Ended

Jun. 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		June 30, 2017
Water	$	1,994.6	$	27.7	$	58.2	$	2,080.5
Electrical	2,222.8		5.3		5.6		2,233.7
Total goodwill	$	4,217.4	$	33.0	$	63.8	$	4,314.2

Detail of Identifiable Intangible Assets

Identifiable intangible assets consisted of the following:

	June 30, 2017							December 31, 2016
In millions	Cost		Accumulated amortization			Net		Cost		Accumulated amortization			Net
Finite-life intangibles
Customer relationships	$	1,507.6	$	(392.2	)	$	1,115.4	$	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	142.8		(100.0		)	42.8		141.3		(100.3		)	41.0
Total finite-life intangibles	1,652.3		(493.7		)	1,158.6		1,621.1		(448.4		)	1,172.7
Indefinite-life intangibles
Trade names	465.7		—			465.7		459.1		—			459.1
Total intangibles, net	$	2,118.0	$	(493.7	)	$	1,624.3	$	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:

	Q3-Q4
In millions	2017		2018		2019		2020		2021		2022
Estimated amortization expense	$	48.7	$	95.4	$	88.5	$	83.4	$	77.1	$	70.0