Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Effective income tax rate	39.70%	35.00%
U.S. federal statutory rate	35.00%
Valuation allowance, deferred tax assets	$ 5.3
Valuation allowance, other comprehensive income and tax expense	4.5		0.8
Unrecognized tax positions increase or decrease, months	12
Offsetting tax benefits related to uncertain tax positions	35.9		2.9
Uncertain tax positions, net	15.2		14.4
Uncertain tax positions	51.1		17.3
Accrued interest and penalties on uncertain tax positions	3.8		3.6
CoreLogic [Member]
Net payable related to Separation-related tax liabilities	2.5		2.5
Net payable related to tax matters prior to Separation	$ 41.3		$ 35.4