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Special Charges and Other, Net Restructuring (Details) - USD ($) $ in Millions | 3 Months Ended | 51 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs | $ 45.1 |  |  |
Contract exit costs | $ (7.0) |  | $ 0.6 |
Supply commitment, period | 10 years |  |  |
Gain on sale of assets | $ 0.0 |  | 4.4 |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance | 47.2 |  |  |
Charges/income | 22.2 |  |  |
Payments | (4.9) |  |  |
Non-cash - Other | 0.5 |  |  |
Restructuring reserve, ending balance | $ 83.0 |  |  | $ 83.0
Contract Termination |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Incurred cost |  | $ 19.5 |  |
Contract termination fee, period | 5 years |  |  |
Employee Severance |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance | $ 0.8 |  |  |
Charges/income | 29.2 |  |  |
Payments | (2.1) |  |  |
Non-cash - Other | 0.0 |  |  |
Restructuring reserve, ending balance | 39.3 |  |  | 39.3
Exit Costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance | 27.3 |  |  |
Charges/income | (7.0) |  |  |
Payments | (2.1) |  |  |
Non-cash - Other | 0.3 |  |  |
Restructuring reserve, ending balance | 25.1 |  |  | 25.1
Other Restructuring |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance | 19.1 |  |  |
Charges/income | 0.0 |  |  |
Payments | (0.7) |  |  |
Non-cash - Other | 0.2 |  |  |
Restructuring reserve, ending balance | 18.6 |  |  | 18.6
Accrued Liabilities |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Current | 55.6 |  |  | 55.6
Other Noncurrent Liabilities |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Non-current | 27.4 |  |  | 27.4
Microsemi Corporation |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Additions due to Microsemi acquisition | 18.0 |  |  |
Microsemi Corporation | Employee Severance |  |  |  |
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 | Other Restructuring |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Additions due to Microsemi acquisition | 0.0 |  |  |
Micrel Incorporated |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Proceeds from sale of property, plant, and equipment |  |  | 10.0 |
Semiconductor products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Employee separation costs | 45.1 |  | 1.1 | 95.0
Contract exit costs | (7.0) |  | 0.6 | 38.5
San Jose Facility | Micrel Incorporated |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain on sale of assets |  |  | $ 4.4 |
Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected cost remaining | 25.0 |  |  | 25.0
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected cost remaining | $ 75.0 |  |  | $ 75.0

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