Segment Results (Schedule Of Goodwill By Segment) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Goodwill	$ 1,205.9	$ 1,149.2	$ 1,167.9
Fluid Handling [Member]
Segment Reporting Information [Line Items]
Goodwill	244.3	212.3	218.7
Payment and Merchandising Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	587.8	563.3	575.2
Aerospace and Electronics [Member]
Segment Reporting Information [Line Items]
Goodwill	202.4	202.3	202.6
Engineered Materials
Segment Reporting Information [Line Items]
Goodwill	$ 171.4	$ 171.3	$ 171.4