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Goodwill and other intangible assets - estimated future amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Estimated future amortization    
2023 $ 313.1  
2024 313.1  
2025 311.9  
2026 310.5  
2027 309.0  
Thereafter 2,483.4  
Carrying value $ 4,041.0 $ 5,048.0