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Accumulated other comprehensive income or loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes in AOCI, net of tax    
Beginning balance $ (100.3) $ (43.2)
Unrealized gain (loss) 11.9 (22.7)
Reclassification of (gain) loss into earnings (6.5) (0.3)
Income tax effect 5.2 (3.1)
Ending balance (89.7) (69.3)
Foreign currency translation    
Changes in AOCI, net of tax    
Beginning balance (131.3) (19.2)
Unrealized gain (loss) 16.9 (27.0)
Reclassification of (gain) loss into earnings 0.0 0.0
Income tax effect 2.7 (2.6)
Ending balance (111.7) (48.8)
Derivative instruments    
Changes in AOCI, net of tax    
Beginning balance 19.9 0.4
Unrealized gain (loss) (0.1) (0.3)
Reclassification of (gain) loss into earnings (6.5) (0.2)
Income tax effect 1.6 0.1
Ending balance 14.9 0.0
Defined benefit plans    
Changes in AOCI, net of tax    
Beginning balance 11.1 (24.4)
Unrealized gain (loss) (4.9) 4.6
Reclassification of (gain) loss into earnings 0.0 (0.1)
Income tax effect 0.9 (0.6)
Ending balance $ 7.1 $ (20.5)