Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible total	$ 256.5	$ 230.1
Other Intangible Assets	278.7	257.3
Amortization expense related to finite-lived intangible assets	$ 20.8	17.6	$ 18.9
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	12 years 4 months 24 days
Finite-lived intangible total	$ 176.3	164.1
Proprietary technology
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	12 years 7 months 6 days
Finite-lived intangible total	$ 58.4	53.7
Patents and other
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	6 years 1 month 6 days
Finite-lived intangible total	$ 21.8	$ 12.3
Rheinhutte Pumpen Group [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	$ 3.3
Rheinhutte Pumpen Group [Member] | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	9 years
Finite-lived intangible total	$ 4.5
Rheinhutte Pumpen Group [Member] | Proprietary technology
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	7 years
Finite-lived intangible total	$ 7.4
Matrix Composites [Member]
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets	$ 8.5
Matrix Composites [Member] | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	14 years