Employee Benefit Plans (Schedule Of Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	$ 201.5	$ 181.8	$ 185.7	$ 214.1
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	40.7	41.8
Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	121.7	96.8
Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	30.2	29.5
Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	8.9	13.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	162.4	138.6
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	40.7	41.8
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	121.7	96.8
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	30.2	29.5
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	0.0	0.0
Level 2 | Stable value funds
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	30.2	29.5
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	8.9	13.7
Assets Measured at NAV | Money market funds, cash and other
Defined Benefit Plan Disclosure [Line Items]
Investments at fair value	$ 8.9	$ 13.7