Schedule of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	$ 631.9	$ 216.7	$ 255.0	$ 628.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Comprehensive Income Before Reclassifications, Net of Tax	(74.4)	181.8	322.5	(231.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8.9)	11.1	(28.9)	12.9
Total Other Comprehensive Income (Loss)	(83.3)	192.9	293.6	(218.4)
Balance, End of Period	548.6	409.6	548.6	409.6
Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	501.2	295.6	135.7	873.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Comprehensive Income Before Reclassifications, Net of Tax	(35.5)	113.9	328.3	(452.5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(3.7)	17.9	(2.0)	6.4
Total Other Comprehensive Income (Loss)	(39.2)	131.8	326.3	(446.1)
Balance, End of Period	462.0	427.4	462.0	427.4
Net Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	369.5	405.5	396.3	401.6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Comprehensive Income Before Reclassifications, Net of Tax	19.9	(3.2)	16.1	4.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(5.9)	(5.1)	(28.9)	(8.7)
Total Other Comprehensive Income (Loss)	14.0	(8.3)	(12.8)	(4.4)
Balance, End of Period	383.5	397.2	383.5	397.2
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	(9.3)	(141.6)	(47.1)	(72.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Comprehensive Income Before Reclassifications, Net of Tax	(60.2)	68.2	(22.4)	(0.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Total Other Comprehensive Income (Loss)	(60.2)	68.2	(22.4)	(0.8)
Balance, End of Period	(69.5)	(73.4)	(69.5)	(73.4)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	(229.5)	(342.8)	(229.9)	(574.5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other Comprehensive Income Before Reclassifications, Net of Tax	1.4	2.9	0.5	217.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.7	(1.7)	2.0	15.2
Total Other Comprehensive Income (Loss)	2.1	1.2	2.5	232.9
Balance, End of Period	$ (227.4)	$ (341.6)	$ (227.4)	$ (341.6)