Schedule of Other Comprehensive Income (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
Accumulated Other Comprehensive Income
Balance, Beginning of Period	$ 216.7		$ 628.0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	181.8		(231.3)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	11.1		12.9
Total Other Comprehensive Income (Loss)	192.9	189.8	(218.4)	328.5
Balance, End of Period	409.6		409.6
Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income
Balance, Beginning of Period	295.6		873.5
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	113.9		(452.5)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	17.9		6.4
Total Other Comprehensive Income (Loss)	131.8		(446.1)
Balance, End of Period	427.4		427.4
Net Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance, Beginning of Period	405.5		401.6
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(3.2)		4.3
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	(5.1)		(8.7)
Total Other Comprehensive Income (Loss)	(8.3)		(4.4)
Balance, End of Period	397.2		397.2
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(141.6)		(72.6)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	68.2		(0.8)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	0		0
Total Other Comprehensive Income (Loss)	68.2		(0.8)
Balance, End of Period	(73.4)		(73.4)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income
Balance, Beginning of Period	(342.8)		(574.5)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	2.9		217.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss, Net of Tax	(1.7)		15.2
Total Other Comprehensive Income (Loss)	1.2		232.9
Balance, End of Period	$ (341.6)		$ (341.6)