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v3.8.0.1

Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Tax loss carryforwards | $ 837.6 | $ 889.6
Postretirement benefits | 437.7 | 728.9
Foreign tax credit carryforwards | 127.0 | 317.6
Other tax credit carryforwards | 29.1 | 91.4
Deferred revenue | 40.9 | 81.0
Employee benefits and compensation | 35.2 | 49.1
Purchased capitalized software | 22.2 | 32.6
Depreciation | 24.5 | 28.3
Warranty, bad debts and other reserves | 5.3 | 16.1
Capitalized costs | 3.1 | 10.9
Other | 39.3 | 27.7
Total deferred tax assets, gross | 1,601.9 | 2,273.2
Valuation allowance | (1,441.1) | (2,084.6)
Total deferred tax assets | 160.8 | 188.6
Deferred tax liabilities |  |
Capitalized research and development | 24.3 | 20.3
Other | 25.8 | 28.4
Total deferred tax liabilities | 50.1 | 48.7
Net deferred tax assets | $ 110.7 | $ 139.9

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