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Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Tax loss carryforwards | $ 860.0 | $ 837.6
Postretirement benefits | 440.3 | 437.7
Foreign tax credit carryforwards | 221.6 | 127.0
Other tax credit carryforwards | 29.8 | 29.1
Deferred revenue | 37.1 | 40.9
Employee benefits and compensation | 31.1 | 35.2
Purchased capitalized software | 22.9 | 22.2
Depreciation | 20.1 | 24.5
Warranty, bad debts and other reserves | 4.8 | 5.3
Capitalized costs | 5.1 | 3.1
Other | 30.4 | 39.3
Total deferred tax assets, gross | 1,703.2 | 1,601.9
Valuation allowance | (1,547.5) | (1,441.1)
Total deferred tax assets | 155.7 | 160.8
Deferred tax liabilities |  |
Capitalized research and development | 36.1 | 24.3
Other | 30.2 | 25.8
Total deferred tax liabilities | 66.3 | 50.1
Net deferred tax assets | $ 89.4 | $ 110.7

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