Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Westlake Building Operating Lease [Member]	Jul. 26, 2011 CoreLogic India [Member]	Jul. 26, 2011 CoreLogic India [Member] Business Process and Information Technology Services [Member]
Long-term Purchase Commitment [Line Items]
Operating Leases Pre-tax Charge For Vacated Premises				$ 14.2
Operating Leases, Rent Expense	63.2	57.0	69.3
Disposal Group, Sales Price					50.0
Long-term Purchase Commitment, Amount						303.5
Disposal Group, Deferred Gain on Disposal					$ 27.1