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Share-based compensation and stockholders' equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,387.7 $ 1,611.5 $ 1,450.9
Other comprehensive income before reclassifications 3.6 20.5  
Amounts reclassified from accumulated other comprehensive income (loss) (12.4) (1.3)  
Total other comprehensive income (loss), net of tax (8.8) 19.2 9.2
Ending balance 649.3 1,387.7 1,611.5
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 3.1 (16.1) (25.3)
Total other comprehensive income (loss), net of tax (8.8) 19.2 9.2
Ending balance (5.7) 3.1 (16.1)
Defined Benefit Pension Plan      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 3.5 (4.0)  
Other comprehensive income before reclassifications 0.0 8.7  
Amounts reclassified from accumulated other comprehensive income (loss) (3.5) (1.2)  
Total other comprehensive income (loss), net of tax (3.5) 7.5 3.7
Ending balance 0.0 3.5 (4.0)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 6.2 (4.5)  
Other comprehensive income before reclassifications 2.7 10.8  
Amounts reclassified from accumulated other comprehensive income (loss) (8.9) (0.1)  
Total other comprehensive income (loss), net of tax (6.2) 10.7 6.5
Ending balance 0.0 6.2 (4.5)
Foreign Currency Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6.6) (7.6)  
Other comprehensive income before reclassifications 0.9 1.0  
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Total other comprehensive income (loss), net of tax 0.9 1.0 (1.0)
Ending balance $ (5.7) $ (6.6) $ (7.6)