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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Reduction in net deferred income tax liabilities due to the remeasuring of existing federal deferred income tax assets and liabilities | $ 383.8 |  |
Discrete deferred income tax adjustments | $ 166.0 |  |
Change In Income Tax Rate, Effect of Change on Earnings Per Share, Basic | $ 0.96 |  |
Change In Income Tax Rate, Effect of Change on Earnings Per Share, Diluted | $ 0.94 |  |
Reduction in deferred income tax liabilities related to tax reform | $ 180.3 |  |
Establishment of valuation allowances related to deferred tax assets due to tax reform | 12.6 |  |
Toll tax on un-repatraited foreign earnings | 1.7 |  |
Regulatory liability, excess deferred federal income taxes due to tax reform | 216.1 |  |
Increase in regulatory liabilities for the tax effect of future revenue reductions | 87.8 |  |
Estimated deferred tax benefit resulting from future income tax reduction | 20.4 |  |
Foreign Tax Authority | French Parliament |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Effective income tax rate reconciliation, change in enacted tax rate, amount (excluding tax cuts and jobs act of 2017 Impact) | 3.9 |  |
Foreign Tax Authority | French Parliament | January 1, 2022 (Fiscal 2023) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit, continuing operations, adjustment of deferred taxes | 17.3 |  |
Increase in per share, basic and diluted resulting from future income tax reduction (in dollars per share) |  | $ 0.10 |
Foreign Tax Authority | French Parliament | January 1, 2020 (Fiscal 2021) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit, continuing operations, adjustment of deferred taxes | $ 27.4 |  |
Increase in per share, basic and diluted resulting from future income tax reduction (in dollars per share) |  | $ 0.15 |
Scenario, Forecast |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Effective income tax rate reconciliation, blended federal rate |  |  | 24.50%

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