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Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Interest Rate Cap |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 1,200.0 |  | $ 1,200.0 |
Cap agreement effective 12/31/18-12/31/20 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 1,400.0 |  | 1,400.0 |
Premium payments on interest rate cap agreements |  |  | 6.0 |
Interest Rate Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain (loss) on effective portion of interest rate cap agreements | $ (4.0) |  | (12.0) |
Unrealized gain (loss) on effective portion of interest rate cap agreements |  | $ 2.0 |  | $ 5.0
Amount expected to be reclassified from AOCL to interest expense in next twelve months |  |  | (6.0) |
Derivative |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income (expense) reclassified into earnings (less than) |  | $ (1.0) | $ (2.0) | $ (2.0)

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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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