Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ (31.9)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,002.7)	(3,797.1)
Other comprehensive income (loss)	1,794.4	61.5	(1,188.5)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	886.1	34.4	(383.8)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	71.6	30.8	(64.4)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	515.2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	483.3
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	(164.3)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	319.0
Other Comprehensive Income, Other, Net of Tax	(0.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	318.7
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(43.2)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,002.7)	(3,797.1)	(3,858.6)	(2,670.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,475.7)
Other comprehensive income (loss)	1,794.4	61.5	(1,188.5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	318.7
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	463.0	426.8	265.9	510.7
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(36.2)
Other comprehensive income (loss)	36.2	160.9	(244.8)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	205.2	72.5	14.8	128.9
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(138.9)
Other comprehensive income (loss)	132.7	57.7	(114.1)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		104.1	59.4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6.2)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		(46.4)	(54.7)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,489.1)	(4,195.2)	(4,032.2)	(3,175.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,387.1)
Other comprehensive income (loss)	1,706.1	(163.0)	(856.4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	319.0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(181.8)	(101.2)	(107.1)	(133.9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	86.5
Other comprehensive income (loss)	(80.6)	5.9	26.8
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		0	32.6
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax		5.9	5.8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 5.9