Retirement Benefits (Components Of Net Periodic Benefit (Credit) Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.5	$ 4.1	$ 10.8	$ 12.3
Interest cost	17.2	19.1	50.6	57.4
Expected return on assets	(33.2)	(33.7)	(99.8)	(101.0)
Recognized actuarial loss	6.1	7.6	23.2	22.8
Settlement loss	2.6	4.0	9.7	10.6
Amortization of prior service credit	(0.2)	(0.2)	(0.6)	(0.6)
Net periodic benefit (credit) cost	(4.0)	0.9	(6.1)	1.5
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.6	1.7	5.0	5.1
Interest cost	5.6	6.8	16.8	20.6
Expected return on assets	(5.5)	(5.2)	(16.5)	(15.7)
Recognized actuarial loss	2.8	3.5	8.4	10.6
Settlement loss	0	0	0	0
Amortization of prior service credit	(3.3)	(3.3)	(10.0)	(10.0)
Net periodic benefit (credit) cost	$ 1.2	$ 3.5	$ 3.7	$ 10.6