Acquisitions - Purchase Price Allocation and Provisional Fair Values (Details) - USD ($) $ in Millions	Oct. 01, 2015	Jul. 31, 2015	Dec. 01, 2014	Jul. 01, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill					$ 152.5	$ 69.2	$ 30.8
A&B Process Systems
Business Acquisition [Line Items]
Accounts receivable	$ 15.7
Prepaids	0.6
Inventories	1.0
Costs in excess of billings on projects in process	5.1
Property, plant and equipment	18.1
Other Assets	0.2
Total assets	67.4
Accounts payable	6.1
Other liabilities	3.3
Billings in excess of costs on projects in process	6.6
Earnout liability	3.0
Total liabilities	19.0
Total purchase price	99.9
Contingent consideration	3.0
Consideration transferred	102.9
Goodwill	51.5
A&B Process Systems | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired	15.5
A&B Process Systems | Tradename
Business Acquisition [Line Items]
Intangible assets acquired	3.5
A&B Process Systems | Technological know-how - skidded systems
Business Acquisition [Line Items]
Intangible assets acquired	4.1
A&B Process Systems | Technological know-how - tanks and vessels
Business Acquisition [Line Items]
Intangible assets acquired	1.3
A&B Process Systems | Noncompete agreement
Business Acquisition [Line Items]
Intangible assets acquired	1.0
A&B Process Systems | Backlog & other assets
Business Acquisition [Line Items]
Intangible assets acquired	$ 1.3
Stork Food Dairy Systems BV
Business Acquisition [Line Items]
Cash		$ 1.1
Accounts receivable		10.0
Other receivables		2.5
Inventories		4.8
Costs in excess of billings on projects in process		7.8
Property, plant and equipment		9.8
Deferred tax asset		1.1
Total assets		45.3
Accounts payable		9.2
Other liabilities		10.2
Billings in excess of costs on projects in process		7.6
Deferred taxes		3.3
Total liabilities		30.3
Total purchase price		51.8
Goodwill		36.8
Stork Food Dairy Systems BV | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired		4.1
Stork Food Dairy Systems BV | Tradename
Business Acquisition [Line Items]
Intangible assets acquired		0.2
Stork Food Dairy Systems BV | Patents
Business Acquisition [Line Items]
Intangible assets acquired		$ 3.9
Wolf-Tec, Inc.
Business Acquisition [Line Items]
Cash			$ 0.0
Accounts receivable			2.3
Other current assets			0.3
Inventories			6.5
Property, plant and equipment			7.7
Deferred tax asset			0.9
Total assets			40.1
Accounts payable			1.7
Other liabilities			1.7
Deferred revenue			0.3
Total liabilities			3.7
Total purchase price			53.9
Consideration transferred			53.7
Goodwill			17.5
Wolf-Tec, Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired			17.0
Wolf-Tec, Inc. | Intellectual property
Business Acquisition [Line Items]
Intangible assets acquired			2.8
Wolf-Tec, Inc. | Tradename
Business Acquisition [Line Items]
Intangible assets acquired			1.5
Wolf-Tec, Inc. | Noncompete agreement
Business Acquisition [Line Items]
Intangible assets acquired			0.8
Wolf-Tec, Inc. | Backlog & other assets
Business Acquisition [Line Items]
Intangible assets acquired			$ 0.3
ICS Solutions
Business Acquisition [Line Items]
Cash				$ 10.0
Accounts receivable				2.3
Inventories				0.4
Property, plant and equipment				0.1
Total assets				36.9
Accounts payable				1.3
Other liabilities				2.4
Deferred revenue				2.3
Deferred taxes				4.1
Total liabilities				10.1
Total purchase price				45.7
Consideration transferred				35.7
Goodwill				18.9
ICS Solutions | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired				15.7
ICS Solutions | Other intangible assets
Business Acquisition [Line Items]
Intangible assets acquired				$ 8.4