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Financial risk management (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Financial Risk Management |  |
Cumulative translation adjustment | $ 32.3 | $ (68.3)
Borrowings | 80.0 | 210.0
Investments and loan receivable | 183.2 | 169.7
Credit Facility |  |
Financial Risk Management |  |
Borrowings |  | 210.0
Foreign Exchange Risk |  |
Financial Risk Management |  |
Cumulative translation adjustment | $ 32.3 | $ (68.3)
Interest Rate Risk |  |
Financial Risk Management |  |
Increase in interest rate used for sensitivity analysis (as a percent) | 0.50% | 0.50%
Decrease in interest rate used for sensitivity analysis (as a percent) | 0.50% | 0.50%
Interest rate sensitivities increase effect on net income | $ 0.3 | $ 0.1
Interest rate sensitivities decrease effect on net income | (0.3) | (0.1)
Interest rate sensitivities increase effect on equity | 0.3 | 0.1
Interest rate sensitivities decrease effect on equity | (0.3) | (0.1)
Borrowings | 80.0 | 207.6
Liquidity Risk |  |
Financial Risk Management |  |
Cash and cash equivalents and available-for-sale securities | $ 132.1 | 69.7
Term of financial liabilities | 1 year |
Capital Risk Management |  |
Financial Risk Management |  |
Cash and cash equivalents and available-for-sale securities | $ 132.1 | 69.7
Investments and loan receivable | 183.2 | 169.7
Liquid securities | 141.7 | 132.8
Capital Risk Management | Credit Facility |  |
Financial Risk Management |  |
Undrawn borrowing facilities | $ 1,100.0 | $ 1,100.0

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