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Derivative Instruments and Hedging Activities - Impact of Derivative Instruments on Consolidated Statements of Income and OCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | $ (5.7) | $ (5.7) | $ (5.7)
Treasury Locks, Net Of Tax |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net Gain (Loss) Recognized in Accumulated OCI (Effective Portion) | $ (17.7) | $ (21.2) |

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- Definition The effective portion of gains and losses on derivative instruments (and non derivative instruments) designated and qualifying as cash flow hedges recorded in accumulated other comprehensive income (loss) during the term of the hedging relationship, net of reclassified amounts. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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