Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 151.4
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 10 months
Gross Asset	$ 579.3	$ 546.7
Accumulated Amortization	302.5	264.5
Finite-Lived Intangible Assets, Net	$ 276.8	282.2	$ 317.1	$ 353.5
Intellectual property rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 10 months
Gross Asset	$ 91.7	86.4
Accumulated Amortization	54.8	52.1
Finite-Lived Intangible Assets, Net	$ 36.9	34.3
Customer relationships and backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 7 months 6 days
Gross Asset	$ 414.7	388.9
Accumulated Amortization	183.4	153.4
Finite-Lived Intangible Assets, Net	$ 231.3	235.5
Drawings [Member]
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	10.4	10.3
Finite-Lived Intangible Assets, Net	$ 0.7	0.8
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	13 years
Gross Asset	$ 61.8	60.3
Accumulated Amortization	53.9	48.7
Finite-Lived Intangible Assets, Net	$ 7.9	$ 11.6