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Information on Reportable and Other Operating Segments (Details)	3 Months Ended										12 Months Ended
	Dec. 31, 2019 USD ($) country	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 01, 2017 USD ($)	Dec. 31, 2019 USD ($) segment country	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business segment
Number of countries in which entity operates | country	17										17
Number of countries in which entity sells its products and services | country	100										100
Number of reportable segments | segment											3
Revenues:
Revenues	$ 444,600,000	$ 364,800,000	$ 372,400,000	$ 343,600,000	$ 445,000,000.0	$ 362,500,000	$ 379,200,000	$ 351,900,000			$ 1,525,400,000	$ 1,538,600,000	$ 1,425,800,000
Income (loss):
Operating income											107,900,000	107,600,000	59,900,000
Pension and postretirement expense											20,200,000	13,700,000	14,900,000
Special charges, net											4,000,000.0	6,300,000	2,700,000
Capital expenditures:
Total capital expenditures											17,800,000	12,400,000	11,000,000.0
Depreciation and amortization:
Total depreciation and amortization											34,500,000	29,200,000	25,200,000
Identifiable assets:
Total identifiable assets	2,134,500,000				2,057,500,000				$ 2,040,400,000		2,134,500,000	2,057,500,000	2,040,400,000
Tangible Long-Lived Assets:
Total tangible long-lived assets	801,400,000				866,300,000				944,400,000		801,400,000	866,300,000	944,400,000
Gain on contract settlement											0	0	10,200,000
United States
Revenues:
Revenues											1,380,600,000	1,317,500,000	1,243,300,000
Tangible Long-Lived Assets:
Total tangible long-lived assets	754,700,000				837,400,000				919,600,000		754,700,000	837,400,000	919,600,000
China
Revenues:
Revenues											31,100,000	38,500,000	28,000,000.0
South Africa
Revenues:
Revenues											(6,100,000)	72,700,000	56,900,000
United Kingdom
Revenues:
Revenues											59,000,000.0	62,400,000	60,800,000
Other
Revenues:
Revenues											60,800,000	47,500,000	36,800,000
Tangible Long-Lived Assets:
Total tangible long-lived assets	46,700,000				28,900,000				24,800,000		46,700,000	28,900,000	24,800,000
Reportable and other operating segments
Income (loss):
Operating income											174,000,000.0	178,500,000	124,900,000
General corporate
Income (loss):
Corporate expense											46,700,000	48,500,000	46,200,000
Special charges, net											200,000	500,000	100,000
Capital expenditures:
Total capital expenditures											2,500,000	800,000	1,900,000
Depreciation and amortization:
Total depreciation and amortization											3,000,000.0	3,000,000.0	3,100,000
Identifiable assets:
Total identifiable assets	220,300,000				295,400,000				457,700,000		220,300,000	295,400,000	457,700,000
Segment reconciling items
Income (loss):
Pension and postretirement expense											0	0	300,000
Long-term incentive compensation expense											13,600,000	15,500,000	15,800,000
Special charges, net											4,000,000.0	6,300,000	2,700,000
Other operating expenses											1,800,000	0	0
Loss on sale of dry cooling business											0	600,000	0
HVAC reportable segment
Revenues:
Revenues											593,200,000	582,100,000	511,000,000.0
HVAC reportable segment | Reportable and other operating segments
Income (loss):
Operating income											95,400,000	90,000,000.0	74,100,000
Special charges, net											800,000	800,000	400,000
Capital expenditures:
Total capital expenditures											5,900,000	2,700,000	2,200,000
Depreciation and amortization:
Total depreciation and amortization											6,900,000	5,400,000	5,500,000
Identifiable assets:
Total identifiable assets	852,000,000.0				778,500,000				747,100,000		852,000,000.0	778,500,000	747,100,000
Detection and Measurement reportable segment
Revenues:
Revenues											384,900,000	320,900,000	260,300,000
Detection and Measurement reportable segment | Reportable and other operating segments
Income (loss):
Operating income											81,700,000	72,400,000	63,400,000
Special charges, net													300,000
Capital expenditures:
Total capital expenditures											2,300,000	1,900,000	800,000
Depreciation and amortization:
Total depreciation and amortization											13,200,000	8,400,000	4,100,000
Identifiable assets:
Total identifiable assets	609,400,000				479,000,000.0				277,800,000		609,400,000	479,000,000.0	277,800,000
Engineered Solutions reportable segment
Revenues:
Revenues											548,900,000	537,000,000.0	560,700,000
Tangible Long-Lived Assets:
Proceeds from contract termination													9,000,000.0
Gain on contract settlement													10,200,000
Engineered Solutions reportable segment | Reportable and other operating segments
Income (loss):
Operating income											43,000,000.0	35,000,000.0	44,200,000
Special charges, net											800,000		400,000
Capital expenditures:
Total capital expenditures											7,000,000.0	6,900,000	5,800,000
Depreciation and amortization:
Total depreciation and amortization											10,700,000	10,600,000	10,400,000
Identifiable assets:
Total identifiable assets	392,900,000				422,400,000				466,200,000		392,900,000	422,400,000	466,200,000
All Other
Revenues:
Revenues											(1,600,000)	98,600,000	93,800,000
Income (loss):
Special charges, net											2,200,000	5,000,000.0	1,500,000
Capital expenditures:
Total capital expenditures											100,000	100,000	300,000
Depreciation and amortization:
Total depreciation and amortization											700,000	1,800,000	2,100,000
Identifiable assets:
Total identifiable assets	$ 59,900,000				$ 82,200,000				91,600,000		59,900,000	82,200,000	91,600,000
All Other | Reportable and other operating segments
Income (loss):
Operating income											(46,100,000)	(18,900,000)	(56,800,000)
Large Power Projects | Revisions in estimates for large power projects | Reportable and other operating segments | South Africa
Revenues:
Revenues											0
Large Power Projects | Revisions in estimates for large power projects | All Other | Reportable and other operating segments | South Africa
Revenues:
Revenues			$ (6,000,000.0)	$ (17,500,000)					(23,400,000)	$ (13,500,000)	(23,500,000)	(2,700,000)	(36,900,000)
Income (loss):
Operating income									$ (29,900,000)	$ (22,900,000)	$ (23,500,000)	$ (4,700,000)	$ (52,800,000)

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