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Long-Term Debt - Narrative (Details) | Jun. 21, 2018 USD ($) | Sep. 30, 2018 USD ($)
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Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt instrument, unused borrowing capacity, amount |  | $ 1,420,000,000
Covenant through June 30, 2019 | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |
Debt Instrument [Line Items] |  |
Covenant requirement, maximum total leverage ratio | 5.0 |
Covenant from September 30, 2019 to June 30, 2020 | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |
Debt Instrument [Line Items] |  |
Covenant requirement, maximum total leverage ratio | 4.75 |
Covenant from September 30, 2020 and thereafter | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |
Debt Instrument [Line Items] |  |
Covenant requirement, maximum total leverage ratio | 4.50 |
Line of Credit | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 1,510,000,000.00 |

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