Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill by Operating Segment

The following table summarizes goodwill by relevant reportable segment as of December 31, 2016 and December 31, 2015 (in millions):



	Balance as of December 31, 2016							Balance as of December 31, 2015
	Goodwill		Accumulated Impairment Losses			Carrying Value		Goodwill		Accumulated Impairment Losses			Carrying Value
Operating Segment
Analog Solutions Group	$	836.7	$	(418.9	)	$	417.8	$	546.7	$	(418.9	)	$	127.8
Image Sensor Group	96.8		—			96.8		95.4		—			95.4
Power Solutions Group	438.7		(28.6		)	410.1		76.0		(28.6		)	47.4
Total	$	1,372.2	$	(447.5	)	$	924.7	$	718.1	$	(447.5	)	$	270.6

Schedule Of Change In Goodwill

The following table summarizes the change in goodwill from December 31, 2014 to December 31, 2016 (in millions):



Net balance as of December 31, 2014	$	263.8
Additions due to business combinations	6.8
Net balance as of December 31, 2015	270.6
Additions due to business combination	657.5
Divestiture of business	(3.4		)
Net balance as of December 31, 2016	$	924.7

Summary of Intangible Assets, Net

Intangible assets, net, were as follows as of December 31, 2016 and December 31, 2015 (in millions):



	December 31, 2016
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(11.2	)	$	(0.4	)	$	2.3
Customer relationships	549.0		(283.3		)	(19.5		)	246.2
Patents	43.7		(25.4		)	(13.7		)	4.6
Developed technology	566.9		(201.6		)	(2.6		)	362.7
Trademarks	17.2		(11.6		)	(1.1		)	4.5
Backlog	3.3		(2.4		)	—			0.9
Favorable Leases	1.5		(0.4		)	—			1.1
IPRD	145.8		—			(6.0		)	139.8
Total intangibles	$	1,341.3	$	(535.9	)	$	(43.3	)	$	762.1



	December 31, 2015
	Original Cost		Accumulated Amortization			Accumulated Impairment Losses			Carrying Value
Intellectual property	$	13.9	$	(10.6	)	$	(0.4	)	$	2.9
Customer relationships	419.8		(239.6		)	(19.8		)	160.4
Patents	43.7		(23.6		)	(13.7		)	6.4
Developed technology	268.0		(152.2		)	(2.6		)	113.2
Trademarks	16.3		(9.9		)	(1.1		)	5.3
Backlog	0.3		(0.3		)	—			—
IPRD	41.4		—			(3.8		)	37.6
Total intangibles	$	803.4	$	(436.2	)	$	(41.4	)	$	325.8

Summary of Amortization Expense

Amortization expense for intangible assets, with the exception of the $139.8 million of IPRD assets that will be amortized once the corresponding projects have been completed, is expected to be as follows over the next five years, and thereafter (in millions):



	Total
2017	$	112.8
2018	94.5
2019	87.7
2020	72.4
2021	59.7
Thereafter	195.2
Total estimated amortization expense	$	622.3