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Derivative and Hedging Activities Derivative and Hedging Activities Fair Value (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2018 and December 31, 2017:
| Asset Derivatives |  | Liability Derivatives
| June 30, 2018 (1) |  | December 31, 2017 |  | June 30, 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 |  | $ | 10.5 |  |  | Other Assets |  | $ | 2.2 |  |  | Other Liabilities |  | $ | — |  |  | 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 June 30, 2018. We did not have any derivative contracts in a liability position as of June 30, 2018 and there were no derivative contracts in a master netting arrangement as of December 31, 2017.

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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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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