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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