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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Derivative Instruments, Gain (Loss) [Line Items] |  |
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges | $ 154.0 | $ 113.7
Investment Income [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | 0.4 |
Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 1.5 |

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- Definition Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) related to hedges of net investments in foreign operations which have been terminated. + References No definition available. + 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 The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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