Discontinued Operations - Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stock-based compensation expense	$ 29.9	$ 12.7	$ 54.0	$ 16.2
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	(248.3)	0.0	(45.0)	0.0
Depreciation and amortization			18.8	38.0
Stock-based compensation expense			10.9	0.8
Capital expenditures			1.9	2.7
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	(256.7)	0.0	(256.7)	0.0
Depreciation and amortization			14.8	19.8
Stock-based compensation expense			8.2	0.4
Capital expenditures			1.6	1.3
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	$ 8.4	$ 0.0	211.7	0.0
Depreciation and amortization			4.0	18.2
Stock-based compensation expense			2.7	0.4
Capital expenditures			$ 0.3	$ 1.4

Disposal Group, Including Discontinued Operation, Gain (Loss) on Disposal Group

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- Definition

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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