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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 1,500,000,000 | $ 1,200,000,000
Long | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative [Line Items] |  |
Derivative notional amount | 215,400,000 | 184,200,000
Long | Foreign currency forward contracts, investment operations |  |
Derivative [Line Items] |  |
Derivative notional amount | 16,600,000 | 26,900,000
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,000,000 | 0
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative notional amount | 801,100,000 | 727,900,000
Short | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative [Line Items] |  |
Derivative notional amount | 44,200,000 | 91,400,000
Short | Foreign currency forward contracts, investment operations |  |
Derivative [Line Items] |  |
Derivative notional amount | 5,100,000 | 57,300,000
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | 18,800,000 | $ 75,200,000
Paying a Fixed Rate | United States of America, Dollars | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | 40,300,000 |
Receiving a Fixed Rate | United States of America, Dollars | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 0 |

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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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