Segment Results (Schedule Of Goodwill By Segment) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 1,449.5	$ 1,206.9	$ 1,149.2
Fluid Handling [Member]
Segment Reporting Information [Line Items]
Goodwill	248.0	245.4	212.3
Payment and Merchandising Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	827.6	587.7	563.3
Aerospace and Electronics [Member]
Segment Reporting Information [Line Items]
Goodwill	202.5	202.4	202.3
Engineered Materials
Segment Reporting Information [Line Items]
Goodwill	$ 171.4	$ 171.4	$ 171.3