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Share-based compensation and stockholders' equity - Schedule of Accumulated Other 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
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance $ 386.3 $ 663.9 $ 649.3 $ 957.7 $ 1,204.1 $ 1,387.7 $ 649.3 $ 1,387.7
Other comprehensive income before reclassifications (1.8) 0.0 0.2 2.1 3.8 (4.5)    
Amounts reclassified from accumulated other comprehensive loss       (3.1) (6.4) 2.4    
Total other comprehensive income (loss), net of tax (1.8) 0.0 0.2 (1.0) (2.6) (2.1) (1.6) (5.7)
Ending balance 508.4 386.3 663.9 697.2 957.7 1,204.1 508.4 697.2
Total                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (5.5) (5.5) (5.7) (1.6) 1.0 3.1 (5.7) 3.1
Total other comprehensive income (loss), net of tax (1.8)   0.2 (1.0) (2.6) (2.1)    
Ending balance (7.3) (5.5) (5.5) (2.6) (1.6) 1.0 (7.3) (2.6)
Defined Benefit Pension Plan                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 0.0 0.0 0.0 0.0 3.5 3.5 0.0 3.5
Other comprehensive income before reclassifications 0.0 0.0 0.0 0.0 0.0 0.0    
Amounts reclassified from accumulated other comprehensive loss       0.0 (3.5) 0.0    
Total other comprehensive income (loss), net of tax 0.0 0.0 0.0 0.0 (3.5) 0.0 0.0 (3.5)
Ending balance 0.0 0.0 0.0 0.0 0.0 3.5 0.0 0.0
Derivative Instruments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance 0.0 0.0 0.0 2.5 4.2 6.2 0.0 6.2
Other comprehensive income before reclassifications 0.0 0.0 0.0 0.9 1.2 (4.4)    
Amounts reclassified from accumulated other comprehensive loss       (3.1) (2.9) 2.4    
Total other comprehensive income (loss), net of tax 0.0 0.0 0.0 (2.2) (1.7) (2.0) 0.0 (5.9)
Ending balance 0.0 0.0 0.0 0.3 2.5 4.2 0.0 0.3
Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning balance (5.5) (5.5) (5.7) (4.1) (6.7) (6.6) (5.7) (6.6)
Other comprehensive income before reclassifications (1.8) 0.0 0.2 1.2 2.6 (0.1)    
Amounts reclassified from accumulated other comprehensive loss       0.0 0.0 0.0    
Total other comprehensive income (loss), net of tax (1.8) 0.0 0.2 1.2 2.6 (0.1) (1.6) 3.7
Ending balance $ (7.3) $ (5.5) $ (5.5) $ (2.9) $ (4.1) $ (6.7) $ (7.3) $ (2.9)