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Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (20.4) | $ (18.9) | $ (20.4) | $ (18.9) | $ (28.9) | $ (23.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 1.2 | 1.2 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (0.6) |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0.6 | 0.0 | 0.6 | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (28.3) | (27.1) | (28.3) | (27.1) | (38.8) | (32.7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 2.6 | 2.5 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | 4.5 | 2.5 | 4.5 | 2.5 | 4.6 | 2.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | (0.1) | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Pension Plan [Member] |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.0 | 0.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | 4.0 | $ 5.7 | 4.0 | 5.7 | 5.3 | $ 7.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | (1.3) | (1.3) |  |
Defined Benefit Plans Income Loss [Member] | Pension Plan [Member] |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | 0.0 |  |  |
Defined Benefit Plans Income Loss [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0.0 |  |  |
Defined Benefit Plan Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0.0 |  |  |
Commodity Contract [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | $ (0.6) |  | (0.6) |  | $ 0.0 |
Amounts removed from accumulated other comprehensive income due to deconsolidation |  |  | 0.0 |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | (0.6) |  |  |
Pension Plan [Member] | Defined Benefit Plan Prior Service Cost [Member] |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0.0 |  |  |
Settlement Cost [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 7.9 | 3.1 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 7.9 | 3.1 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.0 | 0.0 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Pension Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.0 | 0.0 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | $ 0.0 | $ 0.0 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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