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Comprehensive Income - Summary of the Tax Effects Allocated to each Component of Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Comprehensive Income (Loss), Pre-Tax      
Foreign currency translation adjustment $ (62.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ (19.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax $ 18.5us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Change in net realized and unrealized gain (loss) on derivative securities 0.6us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax 1.5us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax (1.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Change in net unrealized gain (loss) on investment securities 5.6us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 19.5us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 21.6us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Other comprehensive income (loss) (55.8)us-gaap_OtherComprehensiveIncomeLossBeforeTax 1.4us-gaap_OtherComprehensiveIncomeLossBeforeTax 39.0us-gaap_OtherComprehensiveIncomeLossBeforeTax
Other Comprehensive Income (Loss), Tax Expenses      
Change in net realized and unrealized gain (loss) on derivative securities (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (0.5)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 0.4us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Change in net unrealized gain (loss) on investment securities (2.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (8.0)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (8.1)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Other comprehensive income (loss) (2.5)us-gaap_OtherComprehensiveIncomeLossTax (8.5)us-gaap_OtherComprehensiveIncomeLossTax (7.7)us-gaap_OtherComprehensiveIncomeLossTax
Other Comprehensive Income (Loss), Net of Tax      
Foreign currency translation adjustment (62.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (19.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 18.5us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Change in net realized and unrealized gain (loss) on derivative securities, net of tax 0.3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 1.0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (0.7)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Change in net unrealized gain (loss) on investment securities 3.4us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 11.5us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 13.5us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income (loss) $ (58.3)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (7.1)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 31.3us-gaap_OtherComprehensiveIncomeLossNetOfTax