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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Benefit (Credits) Costs [Table Text Block] | The components of net periodic benefit cost (credit) are as follows:
|  | Pension Benefits
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (in millions)
Service cost |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 1.0 |  |  | $ | 1.0 |
Interest cost |  | 4.3 |  |  | 5.4 |  |  | 8.6 |  |  | 10.8 |
Expected asset return |  | (9.7) |  |  | (9.7) |  |  | (19.4) |  |  | (19.3) |
Amortized loss |  | 2.7 |  |  | 2.2 |  |  | 5.4 |  |  | 4.3 |
Net periodic benefit credit |  | $ | (2.2) |  |  | $ | (1.6) |  |  | $ | (4.4) |  |  | $ | (3.2) |
|  | Other Postretirement Benefits
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (in millions)
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost |  | 2.1 |  |  | 2.5 |  |  | 4.2 |  |  | 5.1 |
Amortized loss |  | 0.4 |  |  | 0.3 |  |  | 0.8 |  |  | 0.5 |
Amortized prior service credit |  | (0.4) |  |  | (0.4) |  |  | (0.8) |  |  | (0.8) |
Net periodic benefit cost |  | $ | 2.2 |  |  | $ | 2.5 |  |  | $ | 4.4 |  |  | $ | 5.0 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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