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Other Intangible Assets, net - Schedule of Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Expected future amortization of intangible assets    
2021 $ 8.7  
2022 8.1  
2023 8.0  
2024 7.3  
2025 6.6  
2026 and thereafter 24.4  
Acquired Intangible Assets, Net $ 63.1 $ 152.2