Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 10 months 24 days
Gross Asset	$ 564.5	$ 556.9
Accumulated Amortization	255.3	239.8
Net	309.2	317.1
Finite-Lived Intangible Assets, Net	$ 309.2	317.1	$ 353.5
Intellectual Property Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	16 years 5 months
Gross Asset	$ 88.2	88.3
Accumulated Amortization	52.1	51.4
Net	$ 36.1	36.9
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 8 months 6 days
Gross Asset	$ 403.9	395.7
Accumulated Amortization	145.6	132.9
Net	$ 258.3	262.8
Drawings
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	37 years 10 months 24 days
Gross Asset	$ 11.1	11.1
Accumulated Amortization	10.2	10.1
Net	$ 0.9	1.0
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	12 years 9 months 18 days
Gross Asset	$ 61.3	61.8
Accumulated Amortization	47.4	45.4
Net	$ 13.9	$ 16.4