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Derivative Instruments and Hedging Activities - Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Expense and Other |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Loss Reclassified from Accumulated OCI into Income (Effective Portion) | $ (5.3) | $ (5.7) | $ (5.7)
Treasury Locks, Net Of Tax |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net Loss Recognized in Accumulated OCI (Effective Portion) | $ (10.2) | $ (14.2) |

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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 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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