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Goodwill and Other Intangible Assets - Expected Intangible Asset Amortization Expense (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2021 (excluding the nine months ended September 30, 2021) $ 2.5
2022 7.6
2023 5.3
2024 4.5
2025 3.8
Thereafter 2.0
Total $ 25.7