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Derivative Financial Instruments Schedule of Notional Amounts (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Total | $ 10,270.9 | $ 9,038.1
Swaps |  |
Derivative [Line Items] |  |
Total | 855.3 | 515.4
Futures, forwards and spot |  |
Derivative [Line Items] |  |
Total | 3,144.4 | 3,274.5
Written options |  |
Derivative [Line Items] |  |
Total | 3,559.6 | 2,934.2
Purchased options |  |
Derivative [Line Items] |  |
Total | $ 2,711.5 | $ 2,314.1

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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