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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 221.7 |  |
Purchase accounting adjustments |  |  | 11.5 |  |
Foreign currency fluctuations |  |  | (1.2) |  |
Balance, end of period | $ 232.0 |  | 232.0 |  | $ 221.7
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (39.0) |  |
Foreign currency fluctuations |  |  | 0.3 |  |
Balance, end of period | (38.7) |  | (38.7) |  | (39.0)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 182.7 |  |
Purchase accounting adjustments |  |  | 11.5 |  |
Foreign currency fluctuations |  |  | (0.9) |  |
Balance, end of period | 193.3 |  | 193.3 |  | 182.7
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 205.7 |  | 205.7 |  | 191.0
Accumulated amortization | (55.6) |  | (55.6) |  | (44.5)
Carrying value | 150.1 |  | 150.1 |  | 146.5
Purchase of Intangible Assets |  |  | 0.4 | $ 1.2 |
Amortization expense | 5.8 | $ 5.8 | 11.5 | $ 11.7 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2019 | 11.1 |  | 11.1 |  |
2020 | 20.8 |  | 20.8 |  |
2021 | 19.2 |  | 19.2 |  |
2022 | 17.1 |  | 17.1 |  |
2023 | 15.5 |  | 15.5 |  |
Thereafter | 66.4 |  | 66.4 |  |
Total | 150.1 |  | 150.1 |  |
Gaomei |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Purchase of Intangible Assets |  |  | 15.6 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 156.2 |  | 156.2 |  | 143.0
Accumulated amortization | (42.1) |  | (42.1) |  | (33.7)
Carrying value | 114.1 |  | $ 114.1 |  | $ 109.3
Weighted-average original life (in years) |  |  | 14 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 32.2 |  | $ 32.2 |  | $ 30.6
Accumulated amortization | (6.8) |  | (6.8) |  | (5.3)
Carrying value | 25.4 |  | $ 25.4 |  | $ 25.3
Weighted-average original life (in years) |  |  | 11 years |  | 10 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 17.3 |  | $ 17.3 |  | $ 17.4
Accumulated amortization | (6.7) |  | (6.7) |  | (5.5)
Carrying value | $ 10.6 |  | $ 10.6 |  | $ 11.9
Weighted-average original life (in years) |  |  | 11 years |  | 10 years

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