Nature of Operations and Significant Accounting Policies (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 279.7
Gross Asset	890.0	$ 823.6
Accumulated Amortization	384.9	341.8
Finite-Lived Intangible Assets, Net	505.1	481.8
Intellectual Property Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	134.2	130.7
Accumulated Amortization	56.8	55.6
Finite-Lived Intangible Assets, Net	77.4	75.1
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Asset	603.1	546.8
Accumulated Amortization	241.3	210.7
Finite-Lived Intangible Assets, Net	361.8	336.1
Drawings [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	11.1	11.1
Accumulated Amortization	10.5	10.5
Finite-Lived Intangible Assets, Net	0.6	0.6
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Asset	141.6	135.0
Accumulated Amortization	76.3	65.0
Finite-Lived Intangible Assets, Net	$ 65.3	$ 70.0