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Contract Assets and Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
Contract with Customer, Asset and Liability [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | Contract Assets and Liabilities The following table summarizes our beginning and ending balances for accounts receivable and contract liabilities associated with our contracts with customers:
| Accounts Receivable, Net | Contract Liabilities (Current) | Contract Liabilities (Long-term)
December 31, 2018 | $ | 966.5 |  | $ | 44.3 |  | $ | 77.6 |
June 30, 2019 | 1,138.0 |  | 33.6 |  | 87.5 |
Increase/(decrease) | $ | 171.5 |  | $ | (10.7 | ) | $ | 9.9 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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