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Recent Transactions (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Sep. 27, 2017
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,858.1 | $ 1,881.8 |
Sevcon, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Payments to Acquire Businesses, Net of Cash Acquired |  | 185.7 |
Business Combination, Consideration Transferred, Other |  | 26.6 |
Business Combination, Consideration Transferred |  | $ 5.1 |
Receivables, net |  |  | $ 15.9
Inventories, net |  |  | 18.6
Other current assets |  |  | 2.8
Property, plant and equipment, net |  |  | 7.3
Goodwill |  |  | 126.0
Other intangible assets |  |  | 70.7
Deferred tax liabilities |  |  | (9.5)
Income taxes payable |  |  | (0.7)
Other assets and liabilities |  |  | (2.9)
Accounts payable and accrued expenses |  |  | (24.5)
Total consideration, net of cash acquired |  |  | 203.7
Assumed retirement-related liabilities |  |  | 18.0
Goodwill, Purchase Accounting Adjustments | $ (7.6) |  |
Customer Relationships [Member] | Sevcon, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Other intangible assets |  |  | 17.7
Developed Technology Rights [Member] | Sevcon, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Other intangible assets |  |  | 48.8
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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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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