Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 9 months 18 days
Gross Asset	$ 561.2	$ 568.2
Accumulated Amortization	234.2	214.8
Net	327.0	353.5
Finite-Lived Intangible Assets, Net	$ 327.0	353.5	$ 408.9
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	91.3
Accumulated Amortization	51.1	50.4
Net	$ 37.9	40.9
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 6 months
Gross Asset	$ 398.6	402.6
Accumulated Amortization	128.2	112.5
Net	$ 270.4	290.1
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	1.1
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	12 years 10 months 24 days
Gross Asset	$ 62.5	63.2
Accumulated Amortization	44.8	41.8
Net	$ 17.7	$ 21.4