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Goodwill and Other Intangible Assets, net - Other Intangibles and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Other intangible assets |  |
Accumulated Amortization | $ (560.6) | $ (433.4)
Other intangible assets, net |  |
Other intangible assets, Acquired Cost | 1,701.2 | 1,401.1
Other intangible assets, net | 1,140.6 | 967.7
Estimated amortization expense |  |
2020 | 122.5 |
2021 | 115.0 |
2022 | 98.8 |
2023 | 93.2 |
2024 | 84.1 |
Thereafter | $ 384.3 |
Useful life of finite lived intangible assets | 9 years 6 months |
Trade names |  |
Assets not subject to amortization: |  |
Indefinite-lived intangible assets | $ 242.7 | 243.1
Customer relationships |  |
Other intangible assets |  |
Acquired Cost | 1,054.4 | 843.8
Accumulated Amortization | (354.9) | (287.7)
Net Book Value | $ 699.5 | 556.1
Estimated amortization expense |  |
Useful life of finite lived intangible assets | 10 years |
Technology and intellectual property |  |
Other intangible assets |  |
Acquired Cost | $ 304.1 | 268.8
Accumulated Amortization | (167.0) | (129.3)
Net Book Value | $ 137.1 | 139.5
Estimated amortization expense |  |
Useful life of finite lived intangible assets | 6 years 1 month 6 days |
Trade names and other |  |
Other intangible assets |  |
Acquired Cost | $ 100.0 | 45.4
Accumulated Amortization | (38.7) | (16.4)
Net Book Value | $ 61.3 | $ 29.0
Estimated amortization expense |  |
Useful life of finite lived intangible assets | 11 years 3 months 18 days |

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