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Stockholders' equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period     $ 1,036.1  
Balance at end of period $ 1,047.5   1,047.5  
Marketable Securities        
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period 1.7 $ 1.7 1.7 $ 1.7
Other comprehensive income (loss)   0.1   0.1
Balance at end of period 1.7 1.8 1.7 1.8
Currency Translation        
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period (90.8) (101.2) (111.7) (88.8)
Other comprehensive income (loss) 0.1 4.1 21.0 (8.3)
Balance at end of period (90.7) (97.1) (90.7) (97.1)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans        
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period (48.5) (57.8) (49.4) (58.8)
Other comprehensive income (loss) 0.5 0.6 1.4 1.6
Balance at end of period (48.0) (57.2) (48.0) (57.2)
Accumulated Defined Benefit Plans Adjustment | OPEB        
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period 0.1 0.3 0.2 0.4
Other comprehensive income (loss) (0.1) (0.1) (0.2) (0.2)
Balance at end of period   0.2   0.2
Total Accumulated Other Comprehensive Loss        
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest):        
Balance at beginning of period (137.5) (157.0) (159.2) (145.5)
Other comprehensive income (loss) 0.5 4.7 22.2 (6.8)
Balance at end of period $ (137.0) $ (152.3) $ (137.0) $ (152.3)