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Recent Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Sep. 27, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 180.6 | $ 0.0 |  |  |
Goodwill |  | 1,882.1 |  |  |  | $ 1,702.2
Sevcon, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 100.00% |
Payments to Acquire Businesses, Net of Cash Acquired |  | 180.6 |  |  |  |
Business Combination, Consideration Transferred, Other |  | $ 26.6 |  |  |  |
Receivables, net |  |  |  |  | $ 15.9 |
Inventories, net |  |  |  |  | 19.0 |
Other current assets |  |  |  |  | 3.1 |
Property, plant and equipment, net |  |  |  |  | 7.4 |
Goodwill |  |  |  |  | 133.6 |
Other intangible assets |  |  |  |  | 61.1 |
Deferred tax liabilities |  |  |  |  | (8.6) |
Income taxes payable |  |  |  |  | (0.7) |
Other assets and liabilities |  |  |  |  | (2.7) |
Accounts payable and accrued expenses |  |  |  |  | (23.3) |
Total consideration, net of cash acquired |  |  |  |  | 204.8 |
Assumed retirement-related liabilities |  |  |  |  | 19.1 |
Scenario, Forecast [Member] | Sevcon, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 185.7 |  |
Business Combination, Consideration Transferred | $ 5.1 |  |  |  |  |
Customer Relationships [Member] | Sevcon, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangible assets |  |  |  |  | 19.0 |
Developed Technology Rights [Member] | Sevcon, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangible assets |  |  |  |  | 37.9 |
Trade Names [Member] | Sevcon, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Other intangible assets |  |  |  |  | $ 4.2 |
Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 7 years |  |  |  |
Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 20 years |  |  |  |

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