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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | A summary of stock-based compensation costs follows (in millions):
| Year Ended December 31,
| 2020 |  | 2019
Notional stock units and stock appreciation rights | $ | 6.6 |  |  | $ | 1.1 |
Restricted stock units | 0.4 |  |  | 0.2 |
Stock options | 0.1 |  |  | 0.1 |
Total stock-based compensation costs | $ | 7.1 |  |  | $ | 1.4 |
Total recognized tax benefit | $ | — |  |  | $ | — |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Stock Options (thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (millions)
Outstanding at December 31, 2018 |  | 425 |  | $4.14 |  | 6.3 |  | $—
Granted |  | 100 |  | $3.65 |  |  |  |
Exercised |  | (7) |  | $3.93 |  |  |  |
Forfeited/Cancelled |  | — |  | — |  |  |  |
Outstanding at December 31, 2019 |  | 518 |  | $4.02 |  | 6.2 |  | $1.5
Granted |  | — |  | — |  |  |  |
Exercised |  | (107) |  | $3.43 |  |  |  |
Forfeited/Cancelled |  | — |  | — |  |  |  |
Outstanding at December 31, 2020 |  | 411 |  | $4.18 |  | 5.3 |  | $7.8
Exercisable at December 31, 2020 |  | 311 |  | $4.35 |  | 4.2 |  | $5.8
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Stock Exercise Price |  | Options Outstanding (thousands) |  | Remaining Contractual Life in Years |  | Options Exercisable (thousands)
$5.62 |  | 7 |  | 3.9 |  | 7
$4.37 |  | 288 |  | 4.2 |  | 288
$3.93 |  | 8 |  | 4.6 |  | 8
$3.65 |  | 100 |  | 8.8 |  | —
$2.68 |  | 8 |  | 5.4 |  | 8

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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