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Derivative Financial Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Fair Value [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The table below presents the fair value of our derivative financial instruments as well as their classification in the consolidated balance sheets at December 31, 2018 and 2017:
| Asset Derivatives |  | Liability Derivatives
| December 31, 2018 (1) |  | December 31, 2017 |  | December 31, 2018 (1) |  | December 31, 2017
(in millions) | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swaps | Other Assets |  | $ | — |  |  | Other Assets |  | $ | 2.2 |  |  | Other Liabilities |  | $ | 7.4 |  |  | Other Liabilities |  | $ | 0.5 |
(1) | The derivatives subject to master netting arrangements are presented on a gross basis on our condensed consolidated balance sheet as of December 31, 2018. There were no derivative contracts in a master netting arrangement as of December 31, 2018 and 2017.
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The table below presents the effect of our derivative financial instruments in the consolidated statements of income and comprehensive income for the year ended December 31, 2018 and 2017:
(in millions) |  | Unrealized Gain Recognized in Other Comprehensive Income (“OCI”) on Derivatives |  | Location of Gain Reclassified from Accumulated OCI into Income |  | Amount of Gain Reclassified from Accumulated OCI into Income
Derivatives in Cash Flow Hedging Relationships |  | 2018 |  | 2017 |  |  |  | 2018 | 2017
Interest Rate Swaps |  | $ | 6.8 |  |  | $ | 1.7 |  |  | Interest expense |  | $ | 0.4 |  | $ | — |

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- Definition Derivative Instruments and Hedging Activities Fair Value [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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