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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 73.6 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |  |  | $ 18.6 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |  |  | $ 73.6 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 18.6 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Other than Temporary Impairment Losses, Investments |  |  |  |  |  |  |  |  | 4.7 us-gaap_ImpairmentOfInvestments |  |
Proceeds from sale of available for-sale securities |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 24.7 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | (3.6)us-gaap_OtherNonoperatingIncomeExpense | 2.1 us-gaap_OtherNonoperatingIncomeExpense | (2.2)us-gaap_OtherNonoperatingIncomeExpense | 0.1 us-gaap_OtherNonoperatingIncomeExpense | 7.1 us-gaap_OtherNonoperatingIncomeExpense | 6.2 us-gaap_OtherNonoperatingIncomeExpense | 0.2 us-gaap_OtherNonoperatingIncomeExpense | 0 us-gaap_OtherNonoperatingIncomeExpense | (3.7)us-gaap_OtherNonoperatingIncomeExpense | 13.5 us-gaap_OtherNonoperatingIncomeExpense | 0.9 us-gaap_OtherNonoperatingIncomeExpense
Accumulated Net Unrealized Investment Gain | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  | $ 6.1 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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