Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 265.2
Weighted Average Amortization Period of Finite Lived Assets (in years)	17 years 8 months 12 days
Gross Asset	$ 823.6	$ 579.3
Accumulated Amortization	341.8	302.5
Finite-Lived Intangible Assets, Net	$ 481.8	276.8	$ 282.2	$ 317.1
Intellectual Property Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	17 years 2 months 12 days
Gross Asset	$ 130.7	91.7
Accumulated Amortization	55.6	54.8
Finite-Lived Intangible Assets, Net	$ 75.1	36.9
Customer Relationships and Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	18 years 4 months 24 days
Gross Asset	$ 546.8	414.7
Accumulated Amortization	210.7	183.4
Finite-Lived Intangible Assets, Net	$ 336.1	231.3
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	10.5	10.4
Finite-Lived Intangible Assets, Net	$ 0.6	0.8
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	10 years 2 months 12 days
Gross Asset	$ 135.0	61.8
Accumulated Amortization	65.0	53.9
Finite-Lived Intangible Assets, Net	$ 70.0	$ 7.9