Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification out of AOCI
Interest income	$ 1.0	$ 1.6	$ 4.1	$ 2.0
Tax effect	(109.0)	(206.0)	(499.3)	(722.0)
Net earnings	243.9	458.1	1,191.4	1,568.1
Amount Reclassified from AOCI
Reclassification out of AOCI
Net earnings			5.3
Unrealized Gain (Loss) on Securities | Amount Reclassified from AOCI
Reclassification out of AOCI
Interest income			(0.4)
Total before tax			(0.4)
Tax effect			0.1
Net earnings			(0.3)
Defined Benefit Plans | Amount Reclassified from AOCI
Reclassification out of AOCI
Amortization of prior service cost			0.2
Amortization of net loss			8.4
Total before tax			8.6
Tax effect			(3.0)
Net earnings			$ 5.6