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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | Common Stock Plan We have a stock-based compensation plan under which stock options, SSARs, restricted stock (including units) and performance shares awards are granted. At December 31, 2018, 3.0 million shares were available under the current plan for these awards.
| Year ended December 31,
Dollar amounts in millions | 2018 |  | 2017 |  | 2016
Total stock-based compensation expense (costs of sales, selling, general and administrative and other operating credits and charges, net) | $ | 8.6 |  |  | $ | 9.7 |  |  | $ | 13.0 |
Income tax benefit related to stock-based compensation | $ | 3.1 |  |  | $ | 0.8 |  |  | $ | 3.4 |
Impact on cash flow due to taxes paid related to net share settlement of equity awards | $ | 9.3 |  |  | $ | 5.9 |  |  | $ | 9.2 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table sets out the weighted average assumptions used to estimate the fair value of the SSARs granted using the Black-Scholes option-pricing model:
| 2017 |  | 2016
Expected stock price volatility | 41 | % |  | 45 | %
The fair values of stock-based payments were valued using the Black-Scholes valuation method with a volatility factor based on our historical stock prices. |  |  |
Expected dividend yield | — | % |  | — | %
The Black-Scholes valuation model calls for a single expected dividend yield as an input. This is determined based upon current annual dividend as of the date of grant compared to the grant price. |  |  |
Risk-free interest rate | 2.1 | % |  | 1.4 | %
We base the risk-free interest rate used in the Black-Scholes valuation method on U.S. Treasury issues with an equivalent term. Where the expected term of our stock-based awards do not correspond with the terms for which interest rates are quoted, we perform a straight-line interpolation to determine the rate from the available maturities. |  |  |
Expected life of options (in years) | 6 years |  |  | 6 years |
Expected life represents the period that LP’s stock-based awards are expected to be outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior as influenced by changes to the terms of its stock-based awards. |  |  |
Weighted average fair value of options and SSARs granted | $ | 8.02 |  |  | $ | 6.99 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes stock awards as of December 31, 2018 as well as activity during the last year.
| Stock Options / SSARS |  | Restricted stock |  | Restricted units
| Number of Awards |  | Weighted Average Exercise Price |  | Number of Awards |  | Weighted Average Grant Date Fair Value |  | Number of Awards |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 2,404,808 |  |  | $ | 14.76 |  |  | 311,215 |  |  | $ | 17.33 |  |  | 851,244 |  |  | $ | 18.93 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | 491,114 |  |  | 27.74 |
Exercised | (1,201,644 | ) |  | 13.91 |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | — |  |  | — |  |  | (64,747 | ) |  | 17.04 |  |  | (217,000 | ) |  | 17.95 |
Forfeited | (61,478 | ) |  | 17.51 |  |  | (6,294 | ) |  | 16.80 |  |  | (168,744 | ) |  | 21.59 |
Outstanding at December 31, 2018 | 1,141,686 |  |  | $ | 15.50 |  |  | 240,174 |  |  | $ | 17.43 |  |  | 956,614 |  |  | $ | 23.17 |
Vested and expected to vest at December 31, 2018(1) | 1,084,602 |  |  | $ | 15.50 |  |  | 228,165 |  |  | $ | 17.43 |  |  | 908,783 |  |  | $ | 23.17 |
Exercisable at December 31, 2018 | 870,431 |  |  | $ | 14.83 |  |  | — |  |  | — |  |  | — |  |  | $ | — |
Unrecognized compensation costs (in millions) | $ | 0.5 |  |  |  |  | $ | 0.7 |  |  |  |  | $ | 9.7 |  |  |
to be recognized over weighted average period of years | 0.8 |  |  |  |  | 0.6 |  |  |  |  | 1.3 |  |  |
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(1) | Expected to vest based upon historical forfeiture rate

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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