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Income taxes - Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Net income before income taxes |  | $ 236.0 | $ 167.9
Statutory tax rate (as a percent) |  | 26.60% | 26.60%
Tax expense at statutory rate |  | $ 62.8 | $ 44.7
Change in (reversal of) unrecognized deductible temporary differences |  | 0.1 | (4.4)
Income/expenses not (taxed) deductible |  | (3.0) | (1.9)
Differences in foreign statutory tax rates |  | (20.9) | 4.8
Differences due to changing future tax rates |  | (0.9) | (0.8)
Impact of U.S. Tax Reform |  | 7.1 |
Foreign withholding tax |  | 1.4 | 1.8
Temporary differences subject to initial recognition exemption |  | (5.2) | 0.5
Other |  | (0.1) | 1.0
Total income tax expense |  | $ 41.3 | $ 45.7
U.S. corporate income tax rate |  | 35.00% |
Change in U.S. corporate income tax rate |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
U.S. corporate income tax rate | 21.00% |  |

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