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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Operating Segment | The following table summarizes goodwill by operating and reportable segments (in millions):
|  | As of December 31, 2020 |  | As of December 31, 2019 |  | As of December 31, 2018
|  | Goodwill |  | Accumulated Impairment Losses |  |  |  | Carrying Value |  | Goodwill |  | Accumulated Impairment Losses |  |  |  | Carrying Value |  | Goodwill |  | Accumulated Impairment Losses |  |  |  | Carrying Value
Operating and Reportable Segments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ASG |  | $ | 1,566.3 |  |  | $ | (418.9) |  |  |  |  | $ | 1,147.4 |  |  | $ | 1,563.4 |  |  | $ | (418.9) |  |  |  |  | $ | 1,144.5 |  |  | $ | 836.7 |  |  | $ | (418.9) |  |  |  |  | $ | 417.8 |
ISG |  | 114.7 |  |  | — |  |  |  |  | 114.7 |  |  | 114.4 |  |  | — |  |  |  |  | 114.4 |  |  | 114.4 |  |  | — |  |  |  |  | 114.4 |
PSG |  | 433.2 |  |  | (31.9) |  |  |  |  | 401.3 |  |  | 432.2 |  |  | (31.9) |  |  |  |  | 400.3 |  |  | 432.2 |  |  | (31.9) |  |  |  |  | 400.3 |
Total |  | $ | 2,114.2 |  |  | $ | (450.8) |  |  |  |  | $ | 1,663.4 |  |  | $ | 2,110.0 |  |  | $ | (450.8) |  |  |  |  | $ | 1,659.2 |  |  | $ | 1,383.3 |  |  | $ | (450.8) |  |  |  |  | $ | 932.5 |
Schedule of Change in Goodwill | The following table summarizes the change in goodwill (in millions):
Net balance as of December 31, 2018 |  | $ | 932.5 |
Addition due to business combination |  | 726.7 |
Net balance as of December 31, 2019 |  | 1,659.2 |
Addition due to business combination |  | 4.2 |
Net balance as of December 31, 2020 |  | $ | 1,663.4 |
Summary of Intangible Assets, Net | Intangible assets, net, were as follows (in millions):
| As of December 31, 2020
| Original Cost |  | Accumulated Amortization |  |  |  | Accumulated Impairment Losses |  | Carrying Value |  |
Customer relationships | $ | 581.5 |  |  | $ | (411.7) |  |  |  |  | $ | (17.6) |  |  | $ | 152.2 |  |  |
Developed technology | 794.7 |  |  | (532.9) |  |  |  |  | (2.6) |  |  | 259.2 |  |  |
IPRD | 49.5 |  |  | — |  |  |  |  | (25.4) |  |  | 24.1 |  |  |
Licenses | 30.0 |  |  | — |  |  |  |  | — |  |  | 30.0 |  |  |
Other intangibles | 79.3 |  |  | (60.6) |  |  |  |  | (15.2) |  |  | 3.5 |  |  |
Total intangible assets | $ | 1,535.0 |  |  | $ | (1,005.2) |  |  |  |  | $ | (60.8) |  |  | $ | 469.0 |  |  |
| As of December 31, 2019
| Original Cost |  | Accumulated Amortization |  |  |  | Accumulated Impairment Losses |  | Carrying Value |  |
Customer relationships | $ | 585.2 |  |  | $ | (386.8) |  |  |  |  | $ | (20.1) |  |  | $ | 178.3 |  |  |
Developed technology | 779.5 |  |  | (440.3) |  |  |  |  | (2.6) |  |  | 336.6 |  |  |
IPRD | 64.7 |  |  | — |  |  |  |  | (24.1) |  |  | 40.6 |  |  |
Licenses | 30.0 |  |  | — |  |  |  |  | — |  |  | 30.0 |  |  |
Other intangibles | 79.3 |  |  | (59.1) |  |  |  |  | (15.2) |  |  | 5.0 |  |  |
Total intangible assets | $ | 1,538.7 |  |  | $ | (886.2) |  |  |  |  | $ | (62.0) |  |  | $ | 590.5 |  |  |
Summary of Amortization Expense | Amortization expense for intangible assets, with the exception of the $24.1 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
2021 | $ | 99.2 |
2022 | 83.8 |
2023 | 65.9 |
2024 | 54.1 |
2025 | 41.1 |
Thereafter | 100.8 |
Total estimated amortization expense | $ | 444.9 |

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