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INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 3,218.5 | $ 3,480.9
Intellectual property, patents, and other intangibles, net of accumulated amortization of $222.8 and $123.8 |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,007.6 | 1,108.9
Intangible assets, accumulated amortization | 222.8 | 123.8
Backlog, net of accumulated amortization of $205.9 and $92.0 |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,224.7 | 1,342.1
Intangible assets, accumulated amortization | 205.9 | 92.0
Customer relationships, net of accumulated amortization of $276.3 and $212.9 |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 986.2 | 1,029.9
Intangible assets, accumulated amortization | $ 276.3 | $ 212.9

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