Discontinued Operations - Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation expense	$ 21.9	$ 12.8	$ 75.9	$ 29.0
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on sale	3.9	0.0	(41.1)	0.0
Depreciation and amortization			18.8	63.5
Stock-based compensation expense			10.9	1.7
Capital expenditures			1.9	4.4
Discontinued Operations, Disposed of by Sale \| Specialty Vehicle Technologies
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on sale	3.9	0.0	(252.8)	0.0
Depreciation and amortization			14.8	36.2
Stock-based compensation expense			8.2	1.1
Capital expenditures			1.6	1.8
Discontinued Operations, Disposed of by Sale \| High Pressure Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on sale	$ 0.0	$ 0.0	211.7	0.0
Depreciation and amortization			4.0	27.3
Stock-based compensation expense			2.7	0.6
Capital expenditures			$ 0.3	$ 2.6

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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