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Acquisitions, Discontinued Operations, and Other Dispositions - Narrative (Details) € in Millions, $ in Millions		3 Months Ended	12 Months Ended
	Mar. 30, 2016 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2018 EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax			$ 0.0	$ 0.0	$ 16.6
Gain (loss) on disposition of discontinued operations, net of tax			3.0	5.3	(81.3)
Cash consideration, exclusive of cash transferred					30.2
Gain (loss) on sale of dry cooling business			0.0	0.0	18.4
Balcke Durr
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of discontinued operations, net of tax		$ 3.8
Balcke Durr | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax				6.8	16.6
Income tax benefit				9.4	4.5
Net gain | €						€ 3.0
Gain (loss) on disposition of discontinued operations, net of tax		$ 3.8
Other businesses included in discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss recognized with disposition of business			$ 0.8	$ 1.5	2.7
Dry Cooling Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration, exclusive of cash transferred	$ 47.6
Cash transferred with sale of business	3.0
Gain (loss) on sale of dry cooling business	18.4				$ 18.4
Amount Reclassified from AOCI | Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Dry Cooling Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of dry cooling business	$ 40.4

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