Employee Benefit Plans (Schedule Of Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	$ 227.7	$ 215.3	$ 201.5	$ 181.8
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	55.4	51.8
Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	135.4	124.4
Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	31.6	30.9
Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	5.3	8.2
Level 1
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	161.1	149.3
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	34.1	35.3
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	127.0	114.0
Level 1 | Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 1 | Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	61.3	57.8
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	21.3	16.5
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	8.4	10.4
Level 2 | Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	31.6	30.9
Level 2 | Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 3 | Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 3 | Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 3 | Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	5.3	8.2
Assets Measured at NAV | Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	$ 5.3	$ 8.2