Pension And Postretirement Benefits (Schedule Of Fair Value Of Company Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	$ 908.1	$ 808.5
Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	147.6	128.1
Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	5.2	45.3
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	21.8	21.7
NAV Practical Expedient	733.5	613.4
Cash and Money Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	13.2	16.1
Cash and Money Markets [Member] | Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	13.2	16.1
Common Stocks Actively Managed U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	134.4	112.0
Common Stocks Actively Managed U.S. Equities [Member] | Quoted Prices In Active Markets For Identical Assets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	134.4	112.0
Fixed Income Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.3	44.3
Fixed Income Investments [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.3	44.3
U.S. Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	39.1	62.3
NAV Practical Expedient	39.1	62.3
U.S. Equity Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
Non-U.S. Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	249.6	201.9
NAV Practical Expedient	249.6	201.9
Non-U.S. Equity Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
U.S. Fixed Income, Government and Corporate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	59.6	12.4
NAV Practical Expedient	59.6	12.4
U.S. Fixed Income, Government and Corporate [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
Non-U.S. Fixed Income, Government And Corporate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	190.7	165.3
NAV Practical Expedient	190.7	165.3
Non-U.S. Fixed Income, Government And Corporate [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
International Balanced Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	11.8	10.1
NAV Practical Expedient	11.8	10.1
International Balanced Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
CollectiveTrust [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	41.2
NAV Practical Expedient	19.4	17.4
CollectiveTrust [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0
CollectiveTrust [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	21.8	21.7
collectivetrustfund [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value		39.1
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value		106.4
NAV Practical Expedient	116.2	106.4
Hedge Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
International Property Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	116.2	37.6
International Property Funds [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	0.0	0.0
Commodities Fund [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	47.1
Commodities Fund [Member] [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
NAV Practical Expedient	47.1	37.6
Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	4.9	1.0
Annuity Contract [Member] | Significant Other Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value	$ 4.9	$ 1.0