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Additional disclosure items G.1 Fees to auditors (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Auditor's remuneration [abstract]      
Audit fees $ 5.2 $ 5.8 $ 6.8
Audit related fees 1.4 0.5 1.3
Tax fees 0.1 0.1 0.1
Other fees 0.4 0.1 0.6
Total $ 7.1 $ 6.4 $ 8.8