Goodwill and Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	18 years
Gross Asset	$ 655.6	$ 663.6
Accumulated Amortization	341.3	318.7
Net	$ 314.3	344.9	$ 388.5
Intellectual property rights
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	10 years 3 months 18 days
Gross Asset	$ 61.8	62.0
Accumulated Amortization	14.5	14.0
Net	$ 47.3	48.0
Customer relationships and backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	18 years 9 months 18 days
Gross Asset	$ 495.7	502.9
Accumulated Amortization	257.6	242.0
Net	$ 238.1	260.9
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	9 years 10 months 24 days
Gross Asset	$ 98.1	98.7
Accumulated Amortization	69.2	62.7
Net	$ 28.9	$ 36.0