Goodwill And Other Intangible Assets (Schedule Of Finite Lived Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 49.5	$ 31.4
Accumulated Amortization	(12.4)	(9.9)
Total Net Carrying Amount	37.1	21.5
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30.5	16.7
Accumulated Amortization	(8.4)	(6.7)
Total Net Carrying Amount	$ 22.1	$ 10.0
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	8 years 6 months	8 years 6 months
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	14 years	10 years 9 months 18 days
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 18.2	$ 14.3
Accumulated Amortization	(3.6)	(2.8)
Total Net Carrying Amount	$ 14.6	$ 11.5
Trade Names | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	15 years	15 years
Trade Names | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	20 years	20 years
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 0.7	$ 0.3
Accumulated Amortization	(0.3)	$ (0.3)
Total Net Carrying Amount	$ 0.4
Noncompete Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	3 years	3 years
Noncompete Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-average useful lives (in years)	7 years	5 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 0.1	$ 0.1
Accumulated Amortization	$ (0.1)	$ (0.1)
Weighted-average useful lives (in years)	10 years