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Income taxes - Unrecognized (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income taxes    
Aggregate amount of taxable temporary differences associated with investments in subsidiaries for which deferred tax liabilities have not been recognized $ 347.7 $ 336.8
Aggregate amount of deductible temporary differences associated with other items for which deferred tax assets have not been recognized $ 75.7 $ 4.0