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Intangible assets and goodwill - Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 58.7  
2021 57.3  
2022 54.6  
2023 54.4  
2024 and beyond 487.9  
Net $ 712.9 $ 761.6