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Additional disclosure items G.1 Fees to auditors (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Auditor's remuneration [abstract]      
Audit fees $ 5.8 $ 6.8 $ 6.7
Audit related fees 0.5 1.3 0.4
Tax fees 0.1 0.1 0.2
Other fees 0.1 0.6 0.6
Total $ 6.4 $ 8.8 $ 7.7