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Business Acquisitions - Pro Forma (Details) - Microsemi Corporation - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 1,432.5 | $ 1,487.4 | $ 2,859.3 | $ 2,917.6
Net income (loss) | $ 210.0 | $ (30.1) | $ 318.1 | $ (303.7)
Basic net income (loss) per common share (in usd per share) | $ 0.89 | $ (0.13) | $ 1.35 | $ (1.31)
Diluted net income (loss) per common share (in usd per share) | $ 0.83 | $ (0.13) | $ 1.26 | $ (1.31)

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