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Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Components of Deferred Tax Assets [Abstract] |  |
Deferred income on shipments to distributors | $ 39.1 | $ 55.7
Inventory valuation | 10.7 | 14.6
Net operating loss carryforward | 101.1 | 91.6
Capital loss carryforward | 10.6 | 12.9
Share-based compensation | 31.4 | 42.5
Income tax credits | 178.4 | 243.0
Property, plant and equipment | 25.7 | 59.7
Accrued expenses and other | 91.2 | 110.4
Gross deferred tax assets | 488.2 | 630.4
Valuation allowances | (204.5) | (210.1)
Deferred tax assets, net of valuation allowances | 283.7 | 420.3
Components of Deferred Tax Liabilities [Abstract] |  |
Convertible debt | (304.4) | (606.7)
Intangible assets | (66.6) | (147.5)
Other | (18.3) | (6.3)
Deferred Tax Liabilities, Gross | (389.3) | (760.5)
Net deferred tax liability | (105.6) | (340.2)
Non-current deferred tax assets | 100.2 | 68.9
Non-current deferred tax liability | $ (205.8) | $ (409.1)

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