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Stock-based compensation and stockholders' equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 1,202.6 $ 1,383.0 $ 1,575.3 $ 1,619.0 $ 1,383.0 $ 1,619.0
Other comprehensive income (loss) before reclassifications 3.8 (4.5) 2.3 5.4    
Amounts reclassified from accumulated other comprehensive income (loss) (6.4) 2.4 0.9 1.4    
Total other comprehensive income (loss), net of tax (2.6) (2.1) 3.2 6.8 (4.7) 10.0
Ending balance 956.3 1,202.6 1,513.2 1,575.3 956.3 1,513.2
Total            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 1.0 3.1 (9.3) (16.1) 3.1 (16.1)
Total other comprehensive income (loss), net of tax (2.6) (2.1) 3.2 6.8    
Ending balance (1.6) 1.0 (6.1) (9.3) (1.6) (6.1)
Defined Benefit Pension Plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 3.5 3.5 (4.0) (4.0) 3.5 (4.0)
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0 0.0    
Amounts reclassified from accumulated other comprehensive income (loss) (3.5) 0.0 0.0 0.0    
Total other comprehensive income (loss), net of tax (3.5) 0.0 0.0 0.0 (3.5) 0.0
Ending balance 0.0 3.5 (4.0) (4.0) 0.0 (4.0)
Derivative Instruments            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 4.2 6.2 1.8 (4.5) 6.2 (4.5)
Other comprehensive income (loss) before reclassifications 1.2 (4.4) 1.9 4.9    
Amounts reclassified from accumulated other comprehensive income (loss) (2.9) 2.4 0.9 1.4    
Total other comprehensive income (loss), net of tax (1.7) (2.0) 2.8 6.3 (3.7) 9.1
Ending balance 2.5 4.2 4.6 1.8 2.5 4.6
Foreign Currency Translation Adjustments            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (6.7) (6.6) (7.1) (7.6) (6.6) (7.6)
Other comprehensive income (loss) before reclassifications 2.6 (0.1) 0.4 0.5    
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.0    
Total other comprehensive income (loss), net of tax 2.6 (0.1) 0.4 0.5 2.5 0.9
Ending balance $ (4.1) $ (6.7) $ (6.7) $ (7.1) $ (4.1) $ (6.7)