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Derivative Financial Instruments and Hedging Activities (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) | Aug. 29, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Derivative Assets, at Fair Value | $ 2.2 |  |  | $ 0.0
Interest Rate Derivative Liabilities, at Fair Value | 0.5 |  |  | 0.0
Derivative, Net Liability Position, Aggregate Fair Value | 0.5 |  |  |
Unrealized Gain (Loss) on Derivatives | 1.7 |  |  |
Interest Rate Swap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Derivative Assets, at Fair Value | 2.2 |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 0.5 |  |  |
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount |  |  |  | 175.0
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | $ 200.0 | $ 50.0 | $ 100.0 |
Number of Interest Rate Derivatives Held | 3 | 2 |  |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Interest Rate Derivative Assets, at Fair Value | $ 2.2 |  |  | 0.0
Interest Rate Derivative Liabilities, at Fair Value | $ 0.5 |  |  | $ 0.0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + 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 Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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