Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	$ 260.4	$ 454.4	$ 166.4	$ 255.0
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(250.0)	193.8	(157.3)	396.9
Reclassification from Accumulated Other Comprehensive Income or Loss	(7.0)	(16.3)	(5.7)	(20.0)
Net Other Comprehensive Income (Loss)	(257.0)	177.5	(163.0)	376.9
Balance, End of Period	3.4	631.9	3.4	631.9
Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	414.3	325.3	290.3	135.7
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(302.6)	176.6	(184.6)	363.8
Reclassification from Accumulated Other Comprehensive Income or Loss	0.4	(0.7)	6.4	1.7
Net Other Comprehensive Income (Loss)	(302.2)	175.9	(178.2)	365.5
Balance, End of Period	112.1	501.2	112.1	501.2
Net Gain on Cash Flow Hedges
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	411.9	398.0	391.0	396.3
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(11.0)	(12.3)	16.6	(3.8)
Reclassification from Accumulated Other Comprehensive Income or Loss	(9.2)	(16.2)	(15.9)	(23.0)
Net Other Comprehensive Income (Loss)	(20.2)	(28.5)	0.7	(26.8)
Balance, End of Period	391.7	369.5	391.7	369.5
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	(167.4)	(39.5)	(113.4)	(47.1)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	64.9	30.2	10.9	37.8
Reclassification from Accumulated Other Comprehensive Income or Loss	0.0	0.0	0.0	0.0
Net Other Comprehensive Income (Loss)	64.9	30.2	10.9	37.8
Balance, End of Period	(102.5)	(9.3)	(102.5)	(9.3)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income, Net of Tax
Balance, Beginning of Period	(398.4)	(229.4)	(401.5)	(229.9)
Other Comprehensive Income (Loss) Before Reclassifications, Net of Tax	(1.3)	(0.7)	(0.2)	(0.9)
Reclassification from Accumulated Other Comprehensive Income or Loss	1.8	0.6	3.8	1.3
Net Other Comprehensive Income (Loss)	0.5	(0.1)	3.6	0.4
Balance, End of Period	$ (397.9)	$ (229.5)	$ (397.9)	$ (229.5)