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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 235.1 |  |
Purchase accounting adjustments |  |  | 0.0 |  |
Foreign currency fluctuations |  |  | (3.3) |  |
Balance, end of period | $ 231.8 |  | 231.8 |  | $ 235.1
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (40.0) |  |
Foreign currency fluctuations |  |  | 2.1 |  |
Balance, end of period | (37.9) |  | (37.9) |  | (40.0)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 195.1 |  |
Purchase accounting adjustments |  |  | 0.0 |  |
Foreign currency fluctuations |  |  | (1.2) |  |
Balance, end of period | 193.9 |  | 193.9 |  | 195.1
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 201.9 |  | 201.9 |  | 203.0
Accumulated amortization | (75.2) |  | (75.2) |  | (65.3)
Carrying value | 126.7 |  | 126.7 |  | 137.7
Purchase of Intangible Assets |  |  | 0.1 | $ 0.4 |
Amortization expense | 5.0 | $ 5.8 | 10.0 | $ 11.5 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2019 | 10.2 |  | 10.2 |  |
2020 | 18.9 |  | 18.9 |  |
2021 | 16.9 |  | 16.9 |  |
2022 | 15.3 |  | 15.3 |  |
2023 | 13.8 |  | 13.8 |  |
Thereafter | 51.6 |  | 51.6 |  |
Total | 126.7 |  | 126.7 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 153.2 |  | 153.2 |  | 154.1
Accumulated amortization | (57.2) |  | (57.2) |  | (49.8)
Carrying value | 96.0 |  | $ 96.0 |  | $ 104.3
Weighted-average original life (in years) |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 31.8 |  | $ 31.8 |  | $ 31.8
Accumulated amortization | (9.8) |  | (9.8) |  | (8.2)
Carrying value | 22.0 |  | $ 22.0 |  | $ 23.6
Weighted-average original life (in years) |  |  | 11 years |  | 11 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 16.9 |  | $ 16.9 |  | $ 17.1
Accumulated amortization | (8.2) |  | (8.2) |  | (7.3)
Carrying value | $ 8.7 |  | $ 8.7 |  | $ 9.8
Weighted-average original life (in years) |  |  | 11 years |  | 11 years

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