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Derivative Financial Instruments Location of Gains and Losses of Derivative Financial Instruments Designated as Hedging Instruments, Consolidated Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | $ 602.3 | $ 602.4
Net Realized Investment Gain (Loss) | (2.2) | 11.0
Interest and Debt Expense | 40.2 | 39.8
Derivative, Gain (Loss) on Derivative, Net | (0.7) | 0.2
Interest Rate Swaps | Investment Income | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 77.8 | 81.9
Derivative, Gain (Loss) on Derivative, Net | 15.9 | 14.6
Interest Rate Swaps | Investment Income | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 0.7 | 1.4
Derivative, Gain (Loss) on Derivative, Net | (0.4) | (1.0)
Interest Rate Swaps | Net Realized Investment Gain (Loss) | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Realized Investment Gain (Loss) | 0.1 | 0.2
Derivative, Gain (Loss) on Derivative, Net | (0.1) | 0.0
Interest Rate Swaps | Net Realized Investment Gain (Loss) | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Realized Investment Gain (Loss) | 1.9 | (0.6)
Derivative, Gain (Loss) on Derivative, Net | (1.9) | 0.6
Interest Rate Swaps | Interest Expense | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Interest and Debt Expense | 11.4 | 11.4
Derivative, Gain (Loss) on Derivative, Net | 0.6 | 0.5
Interest Rate Swaps | Interest Expense | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Interest and Debt Expense | 3.6 | 3.6
Derivative, Gain (Loss) on Derivative, Net | 0.1 | (0.3)
Foreign Exchange Contracts | Investment Income | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 5.0 | 5.4
Derivative, Gain (Loss) on Derivative, Net | (0.3) | (0.2)
Foreign Exchange Contracts | Investment Income | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 0.1 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Foreign Exchange Contracts | Net Realized Investment Gain (Loss) | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Realized Investment Gain (Loss) | 0.0 | 1.2
Derivative, Gain (Loss) on Derivative, Net | 0.0 | (1.2)
Foreign Exchange Contracts | Net Realized Investment Gain (Loss) | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Realized Investment Gain (Loss) | (0.3) | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.3 | 0.0
Foreign Exchange Contracts | Interest Expense | Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Interest and Debt Expense | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Foreign Exchange Contracts | Interest Expense | Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Interest and Debt Expense | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | $ 0.0 | $ 0.0

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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