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Share-based compensation and stockholders' equity - Schedule of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Pretax $ (1.8)     $ (2.2)     $ (1.6) $ (9.2)
Tax Expense 0.0     1.2     0.0 3.5
Total other comprehensive income (loss), net of tax (1.8) $ 0.0 $ 0.2 (1.0) $ (2.6) $ (2.1) (1.6) (5.7)
Defined Benefit Pension Plan                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Pretax             0.0 (4.1)
Tax Expense             0.0 0.6
Total other comprehensive income (loss), net of tax 0.0 0.0 0.0 0.0 (3.5) 0.0 0.0 (3.5)
Derivative Instruments                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Pretax 0.0     (3.1)     0.0 (8.0)
Tax Expense 0.0     0.9     0.0 2.1
Total other comprehensive income (loss), net of tax 0.0 0.0 0.0 (2.2) (1.7) (2.0) 0.0 (5.9)
Foreign Currency Translation Adjustments                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Pretax (1.8)     0.9     (1.6) 2.9
Tax Expense 0.0     0.3     0.0 0.8
Total other comprehensive income (loss), net of tax $ (1.8) $ 0.0 $ 0.2 $ 1.2 $ 2.6 $ (0.1) $ (1.6) $ 3.7