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Goodwill and Intangible Assets - Intangible Assets Other Than Goodwill and Trade Names (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 3,215.4 | $ 3,218.5
Intellectual property, patents, non-compete and other intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,015.6 | 1,007.6
Intangible assets, accumulated amortization | 274.9 | 223.7
Backlog |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,173.0 | 1,224.7
Intangible assets, accumulated amortization | 259.2 | 206.9
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,026.8 | 986.2
Intangible assets, accumulated amortization | $ 306.4 | $ 276.3

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