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Financial Statement Presentation - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Unsatisfied performance obligations | $ 9,200.0 |
Contracts with customers | $ 221.5 | $ 215.5
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Unsatisfied performance obligations, expected period of satisfaction | 10 years |
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Unsatisfied performance obligations, expected period of satisfaction | 20 years |

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