Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Jul. 25, 2012	Jul. 23, 2012 Infastech [Member]	Jul. 30, 2012 Old Credit Facility [Member]	Jul. 30, 2012 New Credit Facility [Member]	Jul. 30, 2012 New Credit Facility [Member]	Jul. 30, 2012 New Credit Facility [Member] ForeignCurrencySublimit [Member]
Subsequent Event [Line Items]
Cost to acquire Infastech		$ 850
Junior Subordinated Debentures	750
Interest rate on Junior Subordinated Debentures	5.75%
Proceeds from Issuance of Debt	729
Line of Credit Facility, Amount Outstanding			750	1,000
Line of Credit Facility, Number of Days Available			364 days	364 days
Line of Credit Facility, Term Out Provision Period				1 year
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,000.0	$ 400.0