Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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	$ 563.3	$ 556.9
Accumulated Amortization	249.0	239.8
Net	314.3	317.1
Finite-Lived Intangible Assets, Net	$ 314.3	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 6 months
Gross Asset	$ 89.0	88.3
Accumulated Amortization	51.9	51.4
Net	$ 37.1	36.9
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 7 months 6 days
Gross Asset	$ 401.3	395.7
Accumulated Amortization	140.3	132.9
Net	$ 261.0	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	10.1	10.1
Net	$ 1.0	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	$ 61.9	61.8
Accumulated Amortization	46.7	45.4
Net	$ 15.2	$ 16.4