13. Fair Value of Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] As restated and amended [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [member] As restated and amended [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] As restated and amended [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Level 3 [Member] As restated and amended [Member] Fair Value, Measurements, Recurring [Member]
Fair Values of Corporates by Level and Sector:
Consumer	$ 2,893.7	$ 2,560.8			$ 1,056.5	$ 898.4	$ 1,837.2	$ 1,662.4
Energy	390.1	303.1			245.8	171.7	144.3	131.4
Financial services	2,182.8	1,943.2			1,421.9	1,221.3	760.9	721.9
Technical/communications	185.7	154.7			149.9	130.9	35.8	23.8
Transportation	222.0	247.6			72.8	60.2	149.2	187.4
Utilities	1,143.4	1,086.6			519.5	467.4	623.9	619.2
Other	388.7	262.2			206.8	106.8	181.9	155.4
Total corporates	$ 7,406.4	$ 6,558.2			$ 3,673.2	$ 3,056.7	$ 3,733.2	$ 3,501.5