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Transactions with related parties (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Benefits other than equity-based compensation $ 30.2 $ 24.8 $ 26.5
Post-employment benefits 2.7 2.6 2.5
Equity-based compensation 46.3 45.2 47.3
Total 79.2 72.6 76.3
Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Benefits other than equity-based compensation 25.6 20.7 22.5
Post-employment benefits 2.7 2.6 2.5
Equity-based compensation 41.1 40.6 42.5
Total 69.4 63.9 67.5
Non-Executive Director [member]      
Disclosure of transactions between related parties [line items]      
Benefits other than equity-based compensation 4.6 4.1 4.0
Equity-based compensation 5.2 4.6 4.8
Total $ 9.8 $ 8.7 $ 8.8