Equity Equity (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income, Pretax	$ 40.5		$ (53.6)		$ 98.2		$ 23.2
Net current period other comprehensive income (loss)	24.4		(33.9)		58.3		13.7
Total other comprehensive income, Net of Tax	24.4		(33.9)		58.3		13.7
Available-for-Sale Securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income, before Reclassifications, Pretax	56.3		(43.4)		186.3		49.0
Reclassification of (gains) losses into net earnings, Pretax	(15.4)	[1]	(5.7)	[1]	(83.9)	[1]	(20.8)	[1]
Total other comprehensive income, Pretax	40.9		(49.1)		102.4		28.2
Net current period other comprehensive income (loss)					63.0
Other comprehensive income, before Reclassifications, Net of Tax	34.5		(26.3)		114.2		30.0
Reclassification of (gains) losses into net earnings, Net of Tax	(9.4)	[1]	(3.5)	[1]	(51.2)	[1]	(12.7)	[1]
Total other comprehensive income, Net of Tax	25.1		(29.8)				17.3
Cash Flow Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income, before Reclassifications, Pretax	(0.7)		(0.2)		(0.7)		(0.5)
Reclassification of (gains) losses into net earnings, Pretax	1.3	[2]	0.7	[2]	2.0	[2]	1.4	[2]
Total other comprehensive income, Pretax	0.6		0.5		1.3		0.9
Net current period other comprehensive income (loss)					0.7
Other comprehensive income, before Reclassifications, Net of Tax	(0.5)		(0.1)		(0.5)		(0.3)
Reclassification of (gains) losses into net earnings, Net of Tax	0.8	[2]	0.4	[2]	1.2	[2]	0.8	[2]
Total other comprehensive income, Net of Tax	0.3		0.3				0.5
Cumulative Translation Adjustments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total other comprehensive income, Pretax	(1.0)		(5.0)		(5.5)		(5.9)
Net current period other comprehensive income (loss)					(5.4)
Total other comprehensive income, Net of Tax	$ (1.0)		$ (4.4)				$ (4.1)

[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 interest rate cash flow hedges are recognized in interest expense.