INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	$ 3,480.9	$ 547.1
Intellectual property, patents, and other intangibles, net of accumulated amortization of $123.8 and $40.1
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	1,108.9	13.3
Intangible assets, accumulated amortization	123.8	40.1
Backlog, net of accumulated amortization of $92.0 and $2.0
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	1,342.1	2.0
Intangible assets, accumulated amortization	92.0	2.0
Customer relationships, net of accumulated amortization of $212.9 and $158.5
Finite Lived Intangible Assets [Line Items]
Intangible assets, net of accumulated amortization	1,029.9	531.8
Intangible assets, accumulated amortization	$ 212.9	$ 158.5