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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost basis for available-for-sale securities | $ 47.9 |  |  |  | $ 73.6 |  |  |  | $ 47.9 | $ 73.6 | $ 18.6
Other than temporary impairment losses |  |  |  |  |  |  |  |  |  | 4.7 |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  | 68.0 | 0.0 | 24.7
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | $ 0.2 | $ 0.3 | $ 0.2 | $ 36.0 | $ (3.6) | $ 2.1 | $ (2.2) | $ 0.1 | 36.7 | $ (3.7) | 13.5
Available-for-sale securities transferred to trading |  |  |  | $ 25.7 |  |  |  |  |  |  |
Proceeds from trading securities |  |  | $ 37.8 |  |  |  |  |  |  |  |
Realized gain on trading securities |  |  |  |  |  |  |  |  | 0.4 |  |
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 |  |  |  |  |  |  |  |  | 20.1 |  | $ 6.1
Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  | $ 11.7 |  |

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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=56944662&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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