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Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Unrealized gain (loss) on effective portion of interest rate cap agreement | $ 11.3 | $ 5.9 | $ 0.1
Interest Rate Cap |  |  |
Derivative [Line Items] |  |  |
Notional amount | 1,200.0 |  |
Premium payment on interest rate cap agreement | 6.0 |  |
Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Unrealized gain (loss) on effective portion of interest rate cap agreement | 11.0 | 2.0 |
Amount expected to be reclassified from AOCL to interest expense | (8.0) |  |
Derivative |  |  |
Derivative [Line Items] |  |  |
Interest income (expense) reclassified into earnings (less than) | $ (2.0) | $ (5.0) |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 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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- 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 Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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