v3.26.1
Fair value - Narrative (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments in equity securities recorded at cost $ 2.5 $ 3.5 $ 0.0
Estimated fair value of debt $ 3,500.1 3,469.2 3,793.5
Discount rate | Goodwill and intangible assets at fair value | Data Solutions reporting unit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Percentage change in measurement input which would not change impairment recognised 0.0050    
Discount rate | Goodwill | Reporting units excluding Data Solutions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Percentage change in measurement input which would not change impairment recognised 0.005    
Growth rate | Goodwill and intangible assets at fair value | Data Solutions reporting unit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Percentage change in measurement input which would not change impairment recognised 0.0050    
Fair value, nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets $ 11,981.3 12,614.7 12,878.0
Goodwill 8,731.7 9,051.4 9,022.1
Intangible assets $ 3,247.1 $ 3,559.8 $ 3,855.9