Segment Information - Schedule of Segment Reporting Information by Segment Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 3,700.2	$ 3,601.7
Capital Expenditures	113.3	111.4	$ 86.7
Depreciation and amortization	105.3	102.0	90.0
Industrial Process
Segment Reporting Information [Line Items]
Assets	1,025.7	998.1
Capital Expenditures	19.3	24.4	20.4
Depreciation and amortization	27.5	27.9	27.9
Motion Technologies
Segment Reporting Information [Line Items]
Assets	1,140.4	838.4
Capital Expenditures	79.1	73.5	39.3
Depreciation and amortization	49.4	43.2	32.4
Connect & Control Technologies
Segment Reporting Information [Line Items]
Assets	694.8	678.4
Capital Expenditures	10.6	11.7	23.7
Depreciation and amortization	22.8	24.3	23.4
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	839.3	1,086.8
Capital Expenditures	4.3	1.8	3.3
Depreciation and amortization	$ 5.6	$ 6.6	$ 6.3