INTANGIBLES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Intangible Assets Disclosure [Line Items]
Trade names	$ 650.7	$ 623.1
Intangible assets, amortization expense	$ 282.4	$ 238.4	$ 39.8
Valuation Technique, Discounted Cash Flow
Intangible Assets Disclosure [Line Items]
Goodwill impairment test, weight of approach	0.75
Valuation, Market Approach
Intangible Assets Disclosure [Line Items]
Goodwill impairment test, weight of approach	0.25
Trade names
Intangible Assets Disclosure [Line Items]
Useful life (in years)	5 years
Backlog
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	13 years
Intellectual property
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	12 years
Customer relationships
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	17 years
Other intangible assets
Intangible Assets Disclosure [Line Items]
Intangible assets, weighted average useful life (years)	8 years