XML 112 R72.htm IDEA: XBRL DOCUMENT v2.4.1.9
Changes in Level 3 Assets (Detail) (Auction Rate Securities, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Auction Rate Securities
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assets Beginning Balance $ 98.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 $ 97.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Total Gains (Losses):    
Included in Earnings 4.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 [1] 0.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 [1]
Included in Other Comprehensive Income (1.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 [2] 3.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 [2]
Purchases, Issuances, Sales, and Settlements:    
Sales (55.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 (0.6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Settlements (27.8)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 (2.2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
Fair Value Assets Ending Balance $ 18.1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember		 $ 98.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AuctionRateSecuritiesMember
[1] Realized gains for the year ended December 31, 2014, of $4.4 million represents gains from the sale of securities of $1.7 million and redemptions by issuers of $2.7 million. Realized gains for the year ended December 31, 2013, of $0.1 million represents gains from redemptions by issuers. Gains on sales are recorded in investment security gains (losses) and gains on redemptions are recorded in interest income within the consolidated statement of income.
[2] Unrealized gains (losses) are included in net unrealized gains (losses) on securities available for sale, within the consolidated statement of comprehensive income.