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Goodwill and Identifiable Intangible Assets - Amortization Expense and Estimated Future Amortization (Details)
$ in Millions
Sep. 30, 2023
USD ($)
 [1]
Goodwill and Intangible Assets Disclosure [Abstract]  
Estimated amortization expense, 2023 $ 43.7
Estimated amortization expense, 2024 42.1
Estimated amortization expense, 2025 40.5
Estimated amortization expense, 2026 38.4
Estimated amortization expense, 2027 35.9
Estimated amortization expense, 2028 $ 33.7
[1] Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.