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Derivative and Hedging Activities Unrealized Gain in OCI on Derivatives (Tables) | 6 Months Ended
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Jun. 30, 2018
Unrealized Gain on Cash Flow Hedging Activities [Abstract] |
Unrealized Gain (Loss) on Investments [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 six months ended June 30, 2018:
Derivatives in Cash Flow Hedging Relationships |  | 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
| 2018 |  |  |  | 2018
Interest Rate Swaps |  | $ | 8.8 |  |  | Interest expense |  | N/A
The table below presents the effect of our derivative financial instruments in the consolidated statements of income and comprehensive income for the three months ended June 30, 2018:
Derivatives in Cash Flow Hedging Relationships |  | 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
| 2018 |  |  |  | 2018
Interest Rate Swaps |  | $ | 5.2 |  |  | Interest expense |  | N/A

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- Definition Unrealized Gain on Cash Flow Hedging Activities [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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