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Goodwill and Intangible Assets - Intangible Assets Other Than Goodwill and Trade Names (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | $ 3,268.0 | $ 3,218.5
Intellectual property, patents, non-compete and other intangibles |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,038.1 | 1,007.6
Intangible assets, accumulated amortization | 248.6 | 223.7
Backlog |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,192.6 | 1,224.7
Intangible assets, accumulated amortization | 231.8 | 206.9
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, net of accumulated amortization | 1,037.3 | 986.2
Intangible assets, accumulated amortization | $ 287.4 | $ 276.3

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