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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Share-based Compensation [Abstract] |
Share-based compensation expense recorded in 'Selling and administrative expenses' | Share-based compensation expense and cash flow amounts were as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Share-based compensation expense - equity classified awards | $ | 11.3 |  |  | $ | 26.2 |  |  | $ | 46.1 |
Share-based compensation expense - liability classified awards | 1.5 |  |  | 2.0 |  |  | 0.7 |
Total share-based compensation expense | 12.8 |  |  | 28.2 |  |  | 46.8 |
Tax benefit | — |  |  | — |  |  | 17.3 |
Share-based compensation expense, net of tax benefit | $ | 12.8 |  |  | $ | 28.2 |  |  | $ | 29.5 |
Cash received upon the exercise of stock options and from employee stock purchases | — |  |  | 3.4 |  |  | 5.5 |
Write-off tax benefits related to share-based compensation | — |  |  | — |  |  | (8.3 | )
Summary of restricted stock award activity | A summary of restricted stock award activity is as follows:
| Year Ended December 31, 2016 |  | Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2015 | 306,931 |  |  | $ | 184.09 |
Granted | 7,847 |  |  | 7.75 |
Vested | (76,663 | ) |  | 277.28 |
Forfeited | (30,076 | ) |  | 167.68 |
Canceled | (11,295 | ) |  | 82.49 |
Nonvested at December 31, 2016 | 196,744 |  |  | $ | 151.72 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | A summary of restricted stock unit activity is as follows:
| Year Ended December 31, 2016 |  | Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2015 | 48,780 |  |  | $ | 170.42 |
Granted | 342,627 |  |  | 7.75 |
Vested | (23,220 | ) |  | 149.84 |
Forfeited | (59,629 | ) |  | 22.41 |
Nonvested at December 31, 2016 | 308,558 |  |  | $ | 16.98 |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of outstanding option activity under the plans is as follows:
| Year Ended December 31, 2016 |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value (in millions)
Options Outstanding at December 31, 2015 | 240,428 |  |  | $ | 388.16 |  |  | 6.28 |  | $ | — |
Forfeited | (22,182 | ) |  | 419.40 |  |  |  |  |  |
Options Outstanding at December 31, 2016 | 218,246 |  |  | $ | 379.17 |  |  | 5.56 |  | $ | — |
Vested and Exercisable | 162,402 |  |  | $ | 451.88 |  |  | 4.86 |  | $ | — |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted-average fair values of the Company’s stock options and the assumptions used in applying the Black-Scholes option pricing model were as follows:
| Year Ended December 31,
| 2015 |  | 2014
Weighted-average fair value | $ | 43.66 |  |  | $ | 110.70 |
Risk-free interest rate | 1.7 | % |  | 1.7 | %
Expected option life | 5 years |  |  | 5 years |
Expected volatility | 45.2 | % |  | 48.4 | %
Dividend yield | 2.4 | % |  | 1.7 | %
Summary of performance unit activity | A summary of performance unit activity is as follows:
| Year Ended December 31, 2016 |  | Weighted Average Remaining Contractual Life
Nonvested at December 31, 2015 | 81,812 |  |  | 1.7
Forfeited | (5,916 | ) |  |
Vested | (24,474 | ) |  |
Nonvested at December 31, 2016 | 51,422 |  |  | 1.0
Assumptions used in the valuations for grants | The assumptions used in the valuations for grants were as follows:
| Year Ended December 31,
| 2015 |  | 2014
Risk-free interest rate | 1.1 | % |  | 0.8 | %
Expected volatility | 45.0 | % |  | 45.3 | %
Dividend yield | 2.4 | % |  | 1.7 | %

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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