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Income Taxes (Effective and Statutory Rate Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Entity Information [Line Items]                      
Effective Income Tax Rate Reconciliation, Including Discontinued Operations, Percent (35.60%)     16.30%     (9.80%) 15.20%      
Effective Income Tax Rate Reconciliation, at Combined Federal and State Statutory Income Tax Rate, Percent             21.60%        
Non-cash capital contribution $ 2.7 $ (1.5) $ 1.5 $ 3.5 $ (17.9) $ 44.6 $ 2.7 $ 30.2 $ 40.0 $ 97.1 $ 0.0
Estimated Annual Effective Income Tax Rate, Continuing Operations             (10.10%) 16.80% 21.00% 35.00%  
Statutory Federal tax rate                 21.00% 35.00% 35.00%
State taxes, net of Federal tax benefit                 0.40% (1.50%) 0.20%
Depreciation of flow-through differences                 (0.10%) 4.90% (5.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Percent                 (14.60%) (17.60%) 26.70%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent                 (1.00%) 5.10% (3.30%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent                 0.00% 11.00% (75.10%)
Effective Income Tax Rate Reconciliation, Permanent Difference, Percent                 0.00% 4.80% 2.80%
Other, net                 (3.50%) 35.20% (0.70%)
Effective tax rate                 2.20% 76.90% (19.40%)