Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax	$ 3.3		$ 7.6
Accumulated other comprehensive loss	(3,948.7)		(3,948.7)		(4,014.4)	(3,797.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(11.4)		(303.0)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	(77.1)		(151.4)
Other comprehensive income (loss), net of tax	65.7	(385.0)	(151.6)	(75.6)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(122.4)		(241.4)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(119.1)		(233.8)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	42.9		81.5
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	(76.2)		(152.3)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	11.6		1.8
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax	42.1		89.1
Other Comprehensive Income, Other, Net of Tax	(0.9)		0.9
Accumulated Translation Adjustment [Member]
Accumulated other comprehensive loss	92.9		92.9		80.8	426.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	12.1		(333.9)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0		0
Other comprehensive income (loss), net of tax	12.1		(333.9)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated other comprehensive loss	67.0		67.0		90.5	72.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(23.0)		(1.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0.5		3.8
Other comprehensive income (loss), net of tax	(23.5)		(5.5)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated other comprehensive loss	(4,005.2)		(4,005.2)		(4,086.7)	(4,195.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	5.3		37.7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	(76.2)		(152.3)
Other comprehensive income (loss), net of tax	81.5		190.0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated other comprehensive loss	(103.4)		(103.4)		(99.0)	(101.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(5.8)		(5.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	(1.4)		(2.9)
Other comprehensive income (loss), net of tax	$ (4.4)		$ (2.2)