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Additional disclosure items G.1 Fees to auditors (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Auditor's remuneration [abstract]      
Audit fees $ 6.7 $ 4.7 $ 4.3
Audit related fees 0.4 0.3 0.3
Tax fees 0.2 0.2 0.2
Other fees 0.6 0.7 1.8
Total $ 7.7 $ 5.9 $ 6.6