SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	$ 19.9	$ 16.9
Equity method investments	95.2	30.8
Warranty expense	105.5	58.0	$ 50.4
Accrued product warranty	267.7	153.7	153.0
Foreign currency gain (loss)	(13.5)	(5.7)	(6.6)
Noncurrent contract assets	109.4
Noncurrent contract liabilities	77.0
Provisions for loss contracts	118.5	71.2
Letters of Credit Under Credit Agreement	714.0	354.2
Deferred pre-production costs	88.0	16.4
Research and development costs	$ 209.9	$ 87.5	$ 95.2
Valuation Technique, Discounted Cash Flow
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment test, weight of approach	0.75
Valuation, Market Approach
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment test, weight of approach	0.25