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Additional disclosure items G.1 Fees to auditors (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Auditor's remuneration [abstract]      
Audit fees $ 6.8 $ 6.7 $ 4.7
Audit related fees 1.3 0.4 0.3
Tax fees 0.1 0.2 0.2
Other fees 0.6 0.6 0.7
Total $ 8.8 $ 7.7 $ 5.9