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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 |  |

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