Equity Equity (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income, Pretax	$ 57.7		$ 76.8
Total other comprehensive income, Net of Tax	33.9		47.6
Unrealized Gain on Available-for-Sale Securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income, before Reclassifications, Pretax	130.0		92.4
Reclassification of (gains) losses into net earnings, Pretax	(68.5)	[1]	(15.1)	[1]
Total other comprehensive income, Pretax	61.5		77.3
Other comprehensive income, before Reclassifications, Net of Tax	79.7		56.3
Reclassification of (gains) losses into net earnings, Net of Tax	(41.8)	[1]	(9.2)	[1]
Total other comprehensive income, Net of Tax	37.9		47.1
Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income, before Reclassifications, Pretax			(0.3)
Reclassification of (gains) losses into net earnings, Pretax	0.7	[2]	0.7	[2]
Total other comprehensive income, Pretax	0.7		0.4
Other comprehensive income, before Reclassifications, Net of Tax			(0.2)
Reclassification of (gains) losses into net earnings, Net of Tax	0.4	[2]	0.4	[2]
Total other comprehensive income, Net of Tax	0.4		0.2
Cumulative Translation Adjustments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income, Pretax	(4.5)		(0.9)
Total other comprehensive income, Net of Tax	$ (4.4)		$ 0.3

[1] Realized (gains)/losses on available for sale securities are recognized in other income, net.

[2] Reclassification to net earnings of derivatives qualifying as effective cash flow hedges are recognized in interest expense.