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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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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 |

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