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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 235.1 |  |
Purchase accounting adjustments |  |  | 0.0 |  |
Foreign currency fluctuations |  |  | 5.8 |  |
Balance, end of period | $ 240.9 |  | 240.9 |  | $ 235.1
Goodwill, Impairment Loss |  |  | 0.0 |  |
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (40.0) |  |
Foreign currency fluctuations |  |  | 0.5 |  |
Balance, end of period | (39.5) |  | (39.5) |  | (40.0)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 195.1 |  |
Purchase accounting adjustments |  |  | 0.0 |  |
Foreign currency fluctuations |  |  | 6.3 |  |
Balance, end of period | 201.4 |  | 201.4 |  | 195.1
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 209.9 |  | 209.9 |  | 203.0
Accumulated amortization | (83.3) |  | (83.3) |  | (65.3)
Carrying value | 126.6 |  | 126.6 |  | 137.7
Purchase of Intangible Assets |  |  | 0.1 | $ 0.5 |
Amortization expense | 5.3 | $ 5.1 | 15.3 | $ 16.6 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2019 | 5.3 |  | 5.3 |  |
2020 | 19.7 |  | 19.7 |  |
2021 | 17.5 |  | 17.5 |  |
2022 | 16.0 |  | 16.0 |  |
2023 | 14.4 |  | 14.4 |  |
Thereafter | 53.7 |  | 53.7 |  |
Total | 126.6 |  | 126.6 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 159.4 |  | 159.4 |  | 154.1
Accumulated amortization | (63.3) |  | (63.3) |  | (49.8)
Carrying value | 96.1 |  | $ 96.1 |  | $ 104.3
Weighted-average original life (in years) |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 33.1 |  | $ 33.1 |  | $ 31.8
Accumulated amortization | (11.0) |  | (11.0) |  | (8.2)
Carrying value | 22.1 |  | $ 22.1 |  | $ 23.6
Weighted-average original life (in years) |  |  | 11 years |  | 11 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 17.4 |  | $ 17.4 |  | $ 17.1
Accumulated amortization | (9.0) |  | (9.0) |  | (7.3)
Carrying value | $ 8.4 |  | $ 8.4 |  | $ 9.8
Weighted-average original life (in years) |  |  | 11 years |  | 11 years

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