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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 221.7 |  |
Purchase accounting adjustments |  |  | 11.1 |  |
Foreign currency fluctuations |  |  | (10.0) |  |
Balance, end of period | $ 222.8 |  | 222.8 |  | $ 221.7
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (39.0) |  |
Foreign currency fluctuations |  |  | 1.6 |  |
Balance, end of period | (37.4) |  | (37.4) |  | (39.0)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 182.7 |  |
Purchase accounting adjustments |  |  | 11.1 |  |
Foreign currency fluctuations |  |  | (8.4) |  |
Balance, end of period | 185.4 |  | 185.4 |  | 182.7
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 197.9 |  | 197.9 |  | 191.0
Accumulated amortization | (58.4) |  | (58.4) |  | (44.5)
Carrying value | 139.5 |  | 139.5 |  | 146.5
Purchase of Intangible Assets |  |  | 0.5 | $ 2.6 |
Amortization expense | 5.1 | $ 5.7 | 16.6 | $ 17.4 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2019 | 5.4 |  | 5.4 |  |
2020 | 19.9 |  | 19.9 |  |
2021 | 18.4 |  | 18.4 |  |
2022 | 16.3 |  | 16.3 |  |
2023 | 14.9 |  | 14.9 |  |
Thereafter | 64.6 |  | 64.6 |  |
Total | 139.5 |  | 139.5 |  |
Gaomei |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Purchase of Intangible Assets |  |  | 15.7 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 149.9 |  | 149.9 |  | 143.0
Accumulated amortization | (44.3) |  | (44.3) |  | (33.7)
Carrying value | 105.6 |  | $ 105.6 |  | $ 109.3
Weighted-average original life (in years) |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 31.0 |  | $ 31.0 |  | $ 30.6
Accumulated amortization | (7.3) |  | (7.3) |  | (5.3)
Carrying value | 23.7 |  | $ 23.7 |  | $ 25.3
Weighted-average original life (in years) |  |  | 11 years |  | 10 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 17.0 |  | $ 17.0 |  | $ 17.4
Accumulated amortization | (6.8) |  | (6.8) |  | (5.5)
Carrying value | $ 10.2 |  | $ 10.2 |  | $ 11.9
Weighted-average original life (in years) |  |  | 11 years |  | 10 years

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