Nature of Operations and Significant Accounting Policies (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	17 years 9 months 18 days
Gross Asset	$ 892.2	$ 908.2
Accumulated Amortization	426.3	389.1
Net	$ 465.9	519.1	$ 503.7	$ 478.3
Intellectual property rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 2 months 12 days
Gross Asset	$ 131.9	133.2
Accumulated Amortization	54.3	53.4
Net	$ 77.6	79.8
Customer relationships and backlog
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	18 years 3 months 18 days
Gross Asset	$ 611.8	623.7
Accumulated Amortization	270.1	241.9
Net	$ 341.8	381.8
Drawings
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	40 years
Gross Asset	$ 11.1	11.1
Accumulated Amortization	10.6	10.5
Net	$ 0.5	0.6
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	11 years 9 months 18 days
Gross Asset	$ 137.4	140.2
Accumulated Amortization	91.3	83.3
Net	$ 46.0	$ 56.9