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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]          
Financing receivable acquired during period $ 27.0 $ 37.4 $ 27.2 $ 37.4  
Financing receivable significant sales 0 0 0 0  
Financing receivable impairment 3.2   3.2   3.0
[PerformingFinancingReceivableMember]
         
Financing Receivable, Recorded Investment [Line Items]          
Financing receivable 44.0   44.0   46.7
[PerformingFinancingReceivableMember] | [CommercialRealEstateOtherReceivableMember]
         
Financing Receivable, Recorded Investment [Line Items]          
Financing receivable 13.9   13.9   15.4
[PerformingFinancingReceivableMember] | [ResidentialPrimeFinancingReceivableMember]
         
Financing Receivable, Recorded Investment [Line Items]          
Financing receivable 30.1   30.1   31.3
[NonperformingFinancingReceivableMember]
         
Financing Receivable, Recorded Investment [Line Items]          
Financing receivable $ 0   $ 0   $ 0