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INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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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

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