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Accumulated other comprehensive income (loss) - Reclasses Out Of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance $ 385.1 $ 329.0 $ 312.5 $ 446.6 $ 519.9 $ 520.2 $ 312.5 $ 520.2
Other comprehensive income (loss) 6.5 93.2 38.5 (2.7) (75.9) (14.8) 138.2 (93.4)
Acquisitions of noncontrolling interests     (6.6) [1]     (0.2) [2]    
Ending balance 396.5 385.1 329.0 408.1 446.6 519.9 396.5 408.1
AOCI Attributable to Parent                
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance (677.2) (766.5) (804.1) (744.0) (669.0) (656.0) (804.1) (656.0)
Other comprehensive income (loss) before reclassifications             135.5  
Amounts reclassified from accumulated other comprehensive loss to net income             (1.3)  
Other comprehensive income (loss) 7.1 89.3 37.8 (9.7) (75.0) (13.0) 134.2 (97.7)
Acquisitions of noncontrolling interests     (0.2) [1]       (0.2)  
Ending balance (670.1) $ (677.2) (766.5) (753.7) $ (744.0) $ (669.0) (670.1) (753.7)
Benefit Plan Adjustments                
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance     (260.4)       (260.4)  
Other comprehensive income (loss) before reclassifications             (6.7)  
Amounts reclassified from accumulated other comprehensive loss to net income             3.0  
Other comprehensive income (loss) (0.2)     (0.4)     (3.7) (3.7)
Ending balance (264.1)           (264.1)  
Foreign Currency Translation Adjustments                
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance     (556.7)       (556.7)  
Other comprehensive income (loss) before reclassifications             144.7  
Amounts reclassified from accumulated other comprehensive loss to net income             (2.8)  
Other comprehensive income (loss) 9.3     11.6     141.9 (81.6)
Acquisitions of noncontrolling interests             (0.2)  
Ending balance (415.0)           (415.0)  
Gains (losses) on available-for-sale securities                
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance     (3.3)       (3.3)  
Other comprehensive income (loss) before reclassifications             (2.3)  
Amounts reclassified from accumulated other comprehensive loss to net income             3.3  
Other comprehensive income (loss) (0.8)     (4.3)     1.0 (4.9)
Ending balance (2.3)           (2.3)  
Gains (Losses) on Cash Flow Hedges                
Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance     $ 16.3       16.3  
Other comprehensive income (loss) before reclassifications             (0.2)  
Amounts reclassified from accumulated other comprehensive loss to net income             (4.8)  
Other comprehensive income (loss) (1.2)     $ (16.6)     (5.0) $ (7.5)
Ending balance $ 11.3           $ 11.3  
[1] This amount represents the impact of transactions in which we acquired or disposed of noncontrolling ownership interests in certain companies where we had an existing controlling interest prior to and after the related acquisition or disposal transactions.
[2] This amount represents the impact of transactions in which we acquired or disposed of noncontrolling ownership interests in certain companies where we had an existing controlling interest prior to and after the related acquisition or disposal transactions.