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Derivative instruments and hedging activities - Fair Value by Balance Sheet Location (Details) - Interest rate swaps - Designated as Hedging Instrument - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 0.2 $ 0.0
Other Assets    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 2.3 0.0
Other Current Liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 0.0 4.5
Other Liabilities    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 0.0 $ 1.6