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Goodwill and Other Identifiable Intangible Assets - Definite-life Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | $ 1,761.5 | $ 1,327.3
Accumulated amortization | (598.5) | (534.3)
Net | 1,163.0 | 793.0
Customer relationships |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | 1,680.2 | 1,287.6
Accumulated amortization | (576.5) | (519.1)
Net | 1,103.7 | 768.5
Proprietary technology and patents |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | 63.3 | 39.7
Accumulated amortization | (19.1) | (15.2)
Net | 44.2 | $ 24.5
Other finite-lived intangible assets |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Cost | 18.0 |
Accumulated amortization | (2.9) |
Net | $ 15.1 |

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