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Investing Activities - Available-for-sale Investment Proceeds and Related Investment Gains/Losses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt securities, available-for-sale    
Proceeds from sales $ 118.5us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt $ 5.4us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Proceeds from maturities/repayments 58.6us-gaap_ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment 54.0us-gaap_ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment
Gross investment gains from sales, prepayments and maturities 5.0us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments 2.2us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments
Gross investment losses from sales and maturities $ (0.1)phlvic_GrossInvestmentLossesFromSalesAndMaturities $ (0.8)phlvic_GrossInvestmentLossesFromSalesAndMaturities