Business Segment Information - Schedule of Segment Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule Of Assets By Segment [Line Items]
Assets	$ 1,466.2	$ 1,398.3
Sealing Products [Member]
Schedule Of Assets By Segment [Line Items]
Assets	560.2	534.4
Engineered Products [Member]
Schedule Of Assets By Segment [Line Items]
Assets	343.6	329.8
Power Systems [Member]
Schedule Of Assets By Segment [Line Items]
Assets	145.5	131.3
Corporate [Member]
Schedule Of Assets By Segment [Line Items]
Assets	$ 416.9	$ 402.8