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Business Acquisitions - Pro Forma (Details) - Microsemi Corporation - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 1,374.7 | $ 1,462.9 | $ 4,234.0 | $ 4,380.5
Net income (loss) | $ 102.4 | $ (438.8) | $ 420.5 | $ (742.5)
Basic net income (loss) per common share (in usd per share) | $ 0.43 | $ (1.87) | $ 1.78 | $ (3.20)
Diluted net income (loss) per common share (in usd per share) | $ 0.42 | $ (1.87) | $ 1.69 | $ (3.20)

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