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Financial instruments and fair value disclosures - Financial instruments recorded at carrying value (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Financial instruments and fair value disclosures        
Fair value assets level 1 to level 2 transfers     $ 0.0 $ 0.0
Fair value assets level 2 to level 1 transfers     0.0 0.0
Fair value assets transfers into level 3     0.0 0.0
Fair value assets transfers out of level 3     0.0 0.0
Fair value liabilities level 1 to level 2 transfers     0.0 0.0
Fair value liabilities level 2 to level 1 transfers     0.0 0.0
Fair value liabilities transfers into level 3     0.0 0.0
Fair value liabilities transfers out of level 3     0.0 0.0
Carrying value        
Financial instruments and fair value disclosures        
Long-term debt excludes finance leases, deferred financing and other     $ 2,047.0 $ 2,387.0
Interest rate swaps        
Financial instruments and fair value disclosures        
Maturities of interest rate swaps   $ 500.0    
Interest rate swaps | Forecast        
Financial instruments and fair value disclosures        
Maturities of interest rate swaps $ 500.0