Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Service Cost	$ 62.7	$ 69.7
Defined Benefit Plan, Interest Cost	119.2	109.4
Defined Benefit Plan, Expected Return on Plan Assets	(189.3)	(174.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.9	2.6
Defined Benefit Plan, Actuarial Gain (Loss)	69.1	96.0
Defined Benefit Plan, Net Periodic Benefit Cost, Total	62.6	102.8
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Service Cost	11.3	15.1
Defined Benefit Plan, Interest Cost	21.2	23.4
Defined Benefit Plan, Expected Return on Plan Assets	(36.0)	(32.8)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(7.3)	(6.9)
Defined Benefit Plan, Actuarial Gain (Loss)	5.1	23.0
Defined Benefit Plan, Net Periodic Benefit Cost, Total	$ (5.7)	$ 21.8