Retirement Benefits (Fair Values Of Pension Benefit Assets And Other Benefit Assets By Asset Category And Level Inputs) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	$ 587.7	$ 583.9	$ 774.9	$ 771.7
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	1,944.0	1,817.9	1,721.8
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	349.8	320.3	301.1
U.S. Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0	317.6	429.8
Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	160.3	177.7	166.1	153.1
Insurance Company Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	197.4	202.5	195.5	188.8
Life Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	230.0	203.7	95.7	0
Total | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	1,940.3	1,814.7
Total | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	349.6	320.3
Total | U.S. Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	613.8	514.3
Total | U.S. Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	39.0	23.2
Total | Foreign Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	296.8	272.5
Total | Foreign Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	18.6	11.6
Total | Mutual Funds [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	37.4	30.9
Total | Mutual Funds [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	4.7	36.1
Total | Government Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	189.4	210.1
Total | Government Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	14.3	4.3
Total | Corporate Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	272.1	240.5
Total | Corporate Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	14.2	9.2
Total | Asset-Backed Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	127.0	138.7
Total | Asset-Backed Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	11.2	13.8
Total | Common And Collective Trusts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	46.6	28.9
Total | Common And Collective Trusts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	2.2	2.1
Total | Partnership Interests [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	159.1	176.5
Total | Partnership Interests [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	1.2	1.2
Total | Insurance Company Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	197.4	202.5
Total | Life Insurance Contracts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	230.0	203.7
Total | Treasury Futures Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0.7	(0.2)
Total | Investment In DOL 103-12 Trust [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	14.2	15.1
Level I [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	1,126.6	1,009.6
Level I [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	80.9	75.2
Level I [Member] | U.S. Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	613.8	514.3
Level I [Member] | U.S. Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	39.0	23.2
Level I [Member] | Foreign Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	296.8	272.5
Level I [Member] | Foreign Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	18.6	11.6
Level I [Member] | Mutual Funds [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	37.4	30.9
Level I [Member] | Mutual Funds [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	4.7	36.1
Level I [Member] | Government Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	177.9	192.1
Level I [Member] | Government Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	14.3	4.3
Level I [Member] | Corporate Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Corporate Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	4.3	0
Level I [Member] | Asset-Backed Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Asset-Backed Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Common And Collective Trusts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Common And Collective Trusts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Partnership Interests [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Partnership Interests [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Insurance Company Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Life Insurance Contracts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level I [Member] | Treasury Futures Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0.7	(0.2)
Level I [Member] | Investment In DOL 103-12 Trust [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	457.2	426.1
Level II [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	37.5	40.2
Level II [Member] | U.S. Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | U.S. Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Foreign Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Foreign Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Mutual Funds [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Mutual Funds [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Government Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	11.5	18.0
Level II [Member] | Government Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Corporate Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	272.1	240.5
Level II [Member] | Corporate Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	9.9	9.2
Level II [Member] | Asset-Backed Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	127.0	138.7
Level II [Member] | Asset-Backed Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	11.2	13.8
Level II [Member] | Common And Collective Trusts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	46.6	28.9
Level II [Member] | Common And Collective Trusts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	2.2	2.1
Level II [Member] | Partnership Interests [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Partnership Interests [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Insurance Company Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Life Insurance Contracts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Treasury Futures Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level II [Member] | Investment In DOL 103-12 Trust [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	14.2	15.1
Level III [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	356.5	379.0
Level III [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	231.2	204.9
Level III [Member] | U.S. Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | U.S. Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Foreign Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Foreign Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Mutual Funds [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Mutual Funds [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Government Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Government Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Corporate Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Corporate Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Asset-Backed Securities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Asset-Backed Securities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Common And Collective Trusts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Common And Collective Trusts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Partnership Interests [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	159.1	176.5
Level III [Member] | Partnership Interests [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	1.2	1.2
Level III [Member] | Insurance Company Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	197.4	202.5
Level III [Member] | Life Insurance Contracts [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	230.0	203.7
Level III [Member] | Treasury Futures Contracts [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	0	0
Level III [Member] | Investment In DOL 103-12 Trust [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension benefit assets	$ 0	$ 0