Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 156.7
Weighted Average Amortization Period of Finite Lived Assets (in years)	16 years
Gross Asset	$ 546.7	$ 556.9
Accumulated Amortization	264.5	239.8
Finite-Lived Intangible Assets, Net	$ 282.2	317.1	$ 353.5	$ 408.9
Intellectual property rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	16 years 4 months 24 days
Gross Asset	$ 86.4	88.3
Accumulated Amortization	52.1	51.4
Finite-Lived Intangible Assets, Net	$ 34.3	36.9
Customer relationships and backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 8 months 12 days
Gross Asset	$ 388.9	395.7
Accumulated Amortization	153.4	132.9
Finite-Lived Intangible Assets, Net	$ 235.5	262.8
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	10.3	10.1
Finite-Lived Intangible Assets, Net	$ 0.8	1.1
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	13 years
Gross Asset	$ 60.3	61.8
Accumulated Amortization	48.7	45.4
Finite-Lived Intangible Assets, Net	$ 11.6	$ 16.4