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Contract Liabilities and Performance Obligations (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | A contract's transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The following table represents the total transaction price for the remaining performance obligations as of June 30, 2019 related to non-cancelable contracts longer than 12 months in duration that is expected to be recognized over future periods.
(in millions) |  | Within 1 Year |  | Years 1-2 |  | Years 2-3 |  | Thereafter
Remaining performance obligations |  | $ | 40.8 |  |  | $ | 21.7 |  |  | $ | 6.4 |  |  | $ | 0.4 |

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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
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