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Share-based compensation plans - Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense $ 15.6 $ 10.9 $ 23.2 $ 19.3
Cash based awards 0.7 (0.2) 1.1 0.6
Income tax benefit (3.5) (2.5) (5.3) (4.4)
Share-based payment expense, net of tax 12.1 8.4 17.9 14.9
Performance Shares Units PSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense 10.9 7.4 15.8 12.5
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense 3.5 2.9 5.4 4.6
Deferred Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense 0.4 0.5 0.7 0.6
Performance-Based Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense 0.0 0.0 0.0 0.3
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment expense $ 0.1 $ 0.3 $ 0.2 $ 0.7