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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory assets | $ 1,930.5 | $ 2,239.6 |
Regulatory Liabilities | $ 2,065.5 | 2,512.2 |
Expected return on plan assets | 5.70% |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 140.1 | 204.3 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.7 | 0.2 | $ (0.4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 17.0 | 47.6 | $ 14.8
Employer contributions | 2.9 | 2.9 |
Expected contribution | 2.9 |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 2,036.8 | 2,111.5 |
Funded status of plan | $ (59.3) | $ 49.6 |
Expected return on plan assets | 5.70% | 6.10% | 7.00%
Settlement loss | $ 10.5 | $ 9.5 | $ 18.5
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement | 1.4 |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 24.8 | 88.8 |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | (2.1) | (3.2) | (4.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 11.9 | 10.0 | $ 7.5
Employer contributions | 21.6 | 23.0 |
Expected contribution | 21.8 |  |
Funded status of plan | $ 304.4 | $ 315.1 |
Expected return on plan assets | 5.67% | 5.83% | 5.80%
Settlement loss | $ 1.5 | $ 0.0 | $ 0.0
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0.0 | 0.0 | $ 86.1
Percentage of investments | 0.00% |  |
Unrecognized Pension Benefit And Other Postretirement Benefit Costs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory assets | $ 583.3 | 739.1 |
Regulatory Liabilities | 0.0 | 0.1 |
International Equities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 230.1 | 205.0 |
International Equities | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 48.2 | 40.7 |
Commingled Funds | Short-Term Money Markets | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 78.8 | 14.8 |
Commingled Funds | Short-Term Money Markets | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 7.6 | 7.7 |
Commingled Funds | Short-Term Money Markets | Significant Unobservable Inputs (Level 3) [Member] | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 |
Commingled Funds | Short-Term Money Markets | Significant Unobservable Inputs (Level 3) [Member] | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 |
Commingled Funds | United States Equities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 279.7 | 305.9 |
Commingled Funds | United States Equities | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 14.0 | 12.1 |
Commingled Funds | United States Equities | Significant Unobservable Inputs (Level 3) [Member] | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 |
Commingled Funds | United States Equities | Significant Unobservable Inputs (Level 3) [Member] | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 |
Commingled Funds | International Equities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 176.8 | 148.1 |
Commingled Funds | International Equities | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 24.1 | 20.1 |
Commingled Funds | International Equities | Significant Unobservable Inputs (Level 3) [Member] | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 |
Commingled Funds | International Equities | Significant Unobservable Inputs (Level 3) [Member] | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0.0 | $ 0.0 |

X
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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