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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures, Activity in Level 3 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Pension [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | $ 759.4 | $ 699.6
Fair Value, End of Year | 745.7 | 759.4
Pension [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 25.0 |
Fair Value, End of Year | 21.6 | 25.0
Pension [Member] | Private Equity [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 7.0 |
Fair Value, End of Year | 0.0 | 7.0
Pension [Member] | Private Equity [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 7.0 | 8.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | (3.5) | 0.1
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | (3.5) | (1.1)
Fair Value, End of Year | 0.0 | 7.0
Pension [Member] | Real Estate [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 18.0 |
Fair Value, End of Year | 21.6 | 18.0
Pension [Member] | Real Estate [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 18.0 | 18.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 3.6 | 0.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | 0.0 | 0.0
Fair Value, End of Year | 21.6 | 18.0
Postretirement Health and Life [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 186.0 | 173.7
Fair Value, End of Year | 201.8 | 186.0
Postretirement Health and Life [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 1.7 |
Fair Value, End of Year | 2.0 | 1.7
Postretirement Health and Life [Member] | Private Equity [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 1.7 |
Fair Value, End of Year | 2.0 | 1.7
Postretirement Health and Life [Member] | Private Equity [Member] | Level 3 [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Fair Value, Beginning of Year | 1.7 | 1.7
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 0.8 | 0.0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | (0.5) | 0.0
Fair Value, End of Year | $ 2.0 | $ 1.7

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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