Acquisitions and Discontinued Operations - Results of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	$ (4.5)	$ (5.8)	$ 0.2
Income tax (provision) benefit	1.0	0.0	(0.9)
Income (loss) from discontinued operations, net	(3.7)	(4.4)	3.0
Less: Loss from discontinued operations, net of tax	(3.5)	(5.8)	(0.7)
Balcke Dürr | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	0.0	0.0	6.3
Income tax (provision) benefit	0.0	0.0	(2.5)
Income (loss) from discontinued operations, net	0.0	0.0	3.8
All other | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	(4.8)	(4.0)	(1.2)
Income tax (provision) benefit	1.1	(0.4)	0.4
Income (loss) from discontinued operations, net	$ (3.7)	$ (4.4)	$ (0.8)