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Restructuring and Other - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |  |
Employee termination expenses and losses | $ 6.2 | $ 43.5 | $ 34.0
Loss incurred for closing certain facilities | 48.8 |  |
Expenses from restructuring energy generation and storage segment |  |  | 56.1
Impairment loss |  |  | $ 13.3
IPR&D [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Indefinite-lived intangible assets, impairment | 47.0 |  |
IPR&D [Member] | Energy Generation and Storage Segment [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Indefinite-lived intangible assets, impairment | 47.0 |  |
Impairment on related equipment | $ 15.0 |  |

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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