Retirement Benefits (Schedule of Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	$ 334.7	$ 0.0
Defined Benefit Plan, Benefit Obligation, Beginning Balance	12,012.4	9,976.4
Defined Benefit Plan, Service Cost	315.7	240.9	$ 287.1
Defined Benefit Plan, Interest Cost	476.8	472.6	437.2
Defined Benefit Plan, Actuarial Net (Gains) Losses	(812.4)	1,996.3
Defined Benefit Plan, Benefits Paid	(437.8)	(421.2)
Defined Benefit Plan, Plan Amendments	(0.4)	(2.4)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(169.8)	(250.2)
Defined Benefit Plan, Benefit Obligation, Ending Balance	11,719.2	12,012.4	9,976.4
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	9,835.7	9,481.7
Defined Benefit Plan, Actual Return on Plan Assets	90.4	813.6
Defined Benefit Plan, Contributions by Employer	(404.1)	(127.2)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(132.7)	(165.6)
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	9,995.6	9,835.7	9,481.7
Defined Benefit Plan, Funded Status of Plan	(1,723.6)	(2,176.7)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	4,552.7	5,114.9
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	32.5	43.5
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	2,861.6	2,981.7
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	9.9	0.0
Defined Benefit Plan, Benefit Obligation, Beginning Balance	1,553.5	1,757.2
Defined Benefit Plan, Service Cost	45.1	33.0	49.9
Defined Benefit Plan, Interest Cost	62.6	85.6	98.1
Defined Benefit Plan, Actuarial Net (Gains) Losses	(113.5)	293.5
Defined Benefit Plan, Benefits Paid	(77.5)	(76.1)
Defined Benefit Plan, Plan Amendments	0.0	(533.6)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(12.7)	(6.1)
Defined Benefit Plan, Benefit Obligation, Ending Balance	1,467.4	1,553.5	1,757.2
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	1,918.7	1,879.6
Defined Benefit Plan, Actual Return on Plan Assets	85.1	157.4
Defined Benefit Plan, Contributions by Employer	(17.4)	(42.2)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	0.0	0.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	1,943.7	1,918.7	1,879.6
Defined Benefit Plan, Funded Status of Plan	476.3	365.2
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	347.9	439.5
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(574.8)	(666.7)
Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total	249.4	138.0
Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	5,076.2
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	5,040.0	5,076.2
Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	1,579.6
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	1,587.7	1,579.6
Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	2,822.2	2,603.2
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	2,851.1	2,822.2	2,603.2
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	216.5	211.1
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	228.1	216.5	$ 211.1
Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	1,937.3
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	2,104.5	1,937.3
Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	122.6
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	127.9	122.6
Equity Securities [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	411.4
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	414.8	411.4
Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	39.2
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	40.0	39.2
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	227.6
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	227.7	227.6
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	22.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	21.8	22.0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	0.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	0.0	0.0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	0.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	0.0	0.0
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	183.8
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	187.1	183.8
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	17.2
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	18.2	17.2
Equity Securities - International [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	2,337.8
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	2,340.6	2,337.8
Equity Securities - International [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	158.9
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	144.7	158.9
Equity Securities - International [Member] | Fair Value, Inputs, Level 2 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	1,338.1
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	1,384.3	1,338.1
Equity Securities - International [Member] | Fair Value, Inputs, Level 2 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	100.1
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	93.2	100.1
Equity Securities - International [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	0.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	0.0	0.0
Equity Securities - International [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	0.0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	0.0	0.0
Equity Securities - International [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	999.7
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	956.3	999.7
Equity Securities - International [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	58.8
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	$ 51.5	$ 58.8