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Income taxes - Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income taxes    
Deferred income tax expenses $ 10.0 $ 21.8
Net income before income taxes $ 189.1 $ 236.0
Statutory tax rate (as a percent) 26.60% 26.60%
Tax expense at statutory rate $ 50.4 $ 62.8
Change in unrecognized deductible temporary differences 19.0 0.1
Income/expenses not (taxed) deductible (1.0) (3.0)
Differences in foreign statutory tax rates (24.7) (20.9)
Differences due to changing future tax rates 2.9 (0.9)
U.S. Tax Reform impact 2.0 7.1
Foreign withholding tax 0.6 1.4
Temporary differences subject to initial recognition exemption 1.0 (5.2)
Other (0.1) (0.1)
Total income tax expense 50.1 41.3
United States    
Income taxes    
Deferred income tax expenses $ 2.0 $ 7.1
U.S. corporate income tax rate 21.00% 35.00%