Acquisitions - Provisional Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Oct. 01, 2015	Jul. 31, 2015	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 158.0	$ 152.5
A&B Process Systems
Business Acquisition [Line Items]
Trade receivables	$ 15.7
Inventories	1.0
Prepaid expenses	0.6
Costs in excess of billings on projects in progress	5.1
Property, plant and equipment	18.1
Other assets	0.2
Total assets	65.7
Accounts payable	6.1
Billings in excess of costs on projects in progress	6.6
Other liabilities	3.3
Total liabilities	16.0
Total cash consideration paid and accrued	103.0
Goodwill	53.3
A&B Process Systems | Backlog
Business Acquisition [Line Items]
Intangible assets	1.2
A&B Process Systems | Customer relationships
Business Acquisition [Line Items]
Intangible assets	14.6
A&B Process Systems | Non-compete agreements
Business Acquisition [Line Items]
Intangible assets	0.9
A&B Process Systems | Trademark
Business Acquisition [Line Items]
Intangible assets	3.1
A&B Process Systems | Technological know-how - skidded systems
Business Acquisition [Line Items]
Intangible assets	3.9
A&B Process Systems | Technological know-how - tanks and vessels
Business Acquisition [Line Items]
Intangible assets	$ 1.3
Stork Food Dairy Systems BV
Business Acquisition [Line Items]
Cash		$ 1.1
Trade receivables		10.0
Inventories		4.8
Costs in excess of billings on projects in progress		7.8
Property, plant and equipment		9.8
Other assets		2.5
Total assets		42.8
Deferred income taxes		1.6
Accounts payable		9.2
Billings in excess of costs on projects in progress		7.6
Other liabilities		11.3
Deferred income taxes		2.7
Total liabilities		30.8
Total purchase price		51.8
Goodwill		39.8
Stork Food Dairy Systems BV | Customer relationships
Business Acquisition [Line Items]
Intangible assets		2.1
Stork Food Dairy Systems BV | Patents
Business Acquisition [Line Items]
Intangible assets		2.9
Stork Food Dairy Systems BV | Tradename
Business Acquisition [Line Items]
Intangible assets		$ 0.2