ACQUISITIONS - Summary of Preliminary Estimated Fair Values of GE Transportation, Wabtec Company Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Feb. 25, 2019	Dec. 31, 2018
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	$ 8,360.6		$ 2,396.5
General Electric Company
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents		$ 177.6
Accounts receivable		515.5
Inventories		1,189.2
Other current assets		71.5
Property, plant & equipment		1,089.6
Goodwill		5,987.5
Other noncurrent assets		330.3
Total assets acquired		12,586.2
Liabilities assumed
Current liabilities		1,587.5
Contingent consideration		440.0
Other noncurrent liabilities		652.9
Total liabilities assumed		2,680.4
Net assets acquired		9,905.8
Noncontrolling interest		86.8
General Electric Company | Customer Contracts [Member]
Liabilities assumed
Other noncurrent liabilities		504.7
General Electric Company | Trade names
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Acquired intangible assets		55.0
General Electric Company | Customer relationships
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Acquired intangible assets		550.0
General Electric Company | Intellectual Property
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Acquired intangible assets		1,180.0
General Electric Company | Backlog
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Acquired intangible assets		$ 1,440.0