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Special Charges and Other, Net - Restructuring (Details) $ in Millions	6 Months Ended
	Sep. 30, 2018 USD ($)
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 47.2
Charges/income	37.1
Payments	(23.9)
Non-cash - Other	1.0
Restructuring reserve, ending balance	79.4
Current	49.2
Non-current	30.2
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.8
Charges/income	40.1
Payments	(15.5)
Non-cash - Other	0.0
Restructuring reserve, ending balance	36.8
Exit Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	27.3
Charges/income	(3.0)
Payments	(6.5)
Non-cash - Other	0.6
Restructuring reserve, ending balance	25.0
Non-Restructuring, Exit Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	19.1
Charges/income	0.0
Payments	(1.9)
Non-cash - Other	0.4
Restructuring reserve, ending balance	17.6
Microsemi Corporation
Restructuring Reserve [Roll Forward]
Additions due to Microsemi acquisition	18.0
Microsemi Corporation | Employee Separation Costs
Restructuring Reserve [Roll Forward]
Additions due to Microsemi acquisition	11.4
Microsemi Corporation | Exit Costs
Restructuring Reserve [Roll Forward]
Additions due to Microsemi acquisition	6.6
Microsemi Corporation | Non-Restructuring, Exit Costs
Restructuring Reserve [Roll Forward]
Additions due to Microsemi acquisition	$ 0.0

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SAB Topic 5.P.3)
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

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