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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock-Based Compensation [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following table summarizes the Company's pre-tax compensation expense and related income tax benefit for the year s ended December 31, 2013, 2012 and 2011 related to the Company's performance units and restricted stock.
Year ended December 31 (In millions) | 2013 | 2012 | 2011
Performance units |  |  |
Total shareholder return | $ | 8.4 |  | $ | 8.0 |  | $ | 8.2 |
Earnings per share | 2.3 |  | 4.2 |  | 5.5 |
Total performance units | 10.7 |  | 12.2 |  | 13.7 |
Restricted stock | 0.4 |  | 0.6 |  | 1.0 |
Total compensation expense | 11.1 |  | 12.8 |  | 14.7 |
Less: Amount paid by unconsolidated affiliates | 3.1 |  | — |  | — |
Net compensation expense | $ | 8.0 |  | $ | 12.8 |  | $ | 14.7 |
Income tax benefit | $ | 3.1 |  | $ | 4.9 |  | $ | 5.7 |
Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block] | The number of performance units granted based on total shareholder return and the assumptions used to calculate the grant date fair value of the performance units based on total shareholder return are shown in the following table.
| 2013 | 2012 | 2011
Number of units granted | 316,162 |  | 338,678 |  | 427,442 |
Fair value of units granted | $ | 25.89 |  | $ | 25.91 |  | $ | 23.05 |
Expected dividend yield | 2.8 | % | 3.0 | % | 3.2 | %
Expected price volatility | 20.0 | % | 22.0 | % | 33.0 | %
Risk-free interest rate | 0.37 | % | 0.38 | % | 1.40 | %
Expected life of units (in years) | 2.84 |  | 2.87 |  | 2.87 |
Performance Units Earnings Per Share Valuation Assumptions [Table Text Block] | The number of performance units granted based on earnings per share and the grant date fair value are shown in the following table.
| 2013 | 2012 | 2011
Number of units granted | 74,570 |  | 81,594 |  | 142,476 |
Fair value of units granted | $ | 26.73 |  | $ | 23.82 |  | $ | 20.81 |
Restricted Stock Valuation Assumptions [Table Text Block] | The number of shares of restricted stock granted and the grant date fair value are shown in the following table.
| 2013 | 2012 | 2011
Shares of restricted stock granted | 5,940 |  | 10,824 |  | 35,804 |
Fair value of restricted stock granted | $ | 29.71 |  | $ | 26.72 |  | $ | 24.41 |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of the activity for the Company's non-vested performance units and restricted stock at December 31, 2013 and changes in 2013 are shown in the following table.
| Performance Units |  |
| Total Shareholder Return | Earnings Per Share | Restricted Stock
| Number of Units |  | Weighted-Average Grant Date Fair Value | Number of Units |  | Weighted-Average Grant Date Fair Value | Number of Shares | Weighted-Average Grant Date Fair Value
Units/Shares Non-Vested at 12/31/12 | 691,862 |  |  | $ | 24.40 |  | 202,078 |  |  | $ | 22.00 |  | 49,106 |  | $ | 23.61 |
Granted | 316,162 |  | (A) | $ | 25.89 |  | 74,570 |  | (A) | $ | 26.73 |  | 5,940 |  | $ | 29.71 |
Modification | 87,150 |  | (B) | $ | 36.29 |  | 87,170 |  | (B) | $ | 30.62 |  | N/A |  | N/A |
Vested | (355,078 | ) |  | $ | 23.05 |  | (118,350 | ) |  | $ | 20.81 |  | (30,242 | ) | $ | 22.57 |
Forfeited | (33,114 | ) |  | $ | 24.96 |  | (9,792 | ) |  | $ | 23.34 |  | (1,176 | ) | $ | 26.87 |
Units/Shares Non-Vested at 12/31/13 | 706,982 |  |  | $ | 25.90 |  | 235,676 |  |  | $ | 25.28 |  | 23,628 |  | $ | 26.30 |
Units/Shares Expected to Vest | 633,808 |  | (C) |  | 209,938 |  | (C) |  | 23,628 |  |
(A) | For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
Fair Value of Vested Performance Units and Restricted Stock [Table Text Block] | A summary of the Company's fair value for its vested performance units and restricted stock is shown in the following table.
Year ended December 31 (In millions) | 2013 | 2012 | 2011
Performance units |  |  |
Total shareholder return | $ | 8.2 |  | $ | 7.4 |  | $ | 7.4 |
Earnings per share | 4.9 |  | 4.1 |  | 3.9 |
Restricted stock | 0.7 |  | 0.7 |  | 1.0 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] | A summary of the Company's unrecognized compensation cost for its non-vested performance units and restricted stock and the weighted-average periods over which the compensation cost is expected to be recognized are shown in the following table.
December 31, 2013 | Unrecognized Compensation Cost (in millions) | Weighted Average to be Recognized (in years)
Performance units |  |
Total shareholder return | $ | 8.4 |  | 1.63
Earnings per share | 1.8 |  | 1.49
Total performance units | 10.2 |  |
Restricted stock | 0.2 |  | 1.63
Total | $ | 10.4 |  |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of the activity for the Company's stock options at December 31, 2013 and changes during 2013 are shown in the following table.
(dollars in millions) | Number of Options | Weighted-Average Exercise Price | Aggregate Intrinsic Value | Weighted-Average Remaining Contractual Term
Options Outstanding at 12/31/12 | 39,200 |  | $ | 11.40 |  |  |  |  |
Exercised | (39,200 | ) | $ | (11.40 | ) | $ | 1.4 |  |  |
Options Outstanding at 12/31/13 | — |  | $ | — |  | $ | — |  | 0.00 | years
Options Fully Vested and Exercisable at 12/31/13 | — |  | $ | — |  | $ | — |  | 0.00 | years
Exercised Stock Options [Table Text Block] | A summary of the activity for the Company's exercised stock options in 2013, 2012 and 2011 are shown in the following table.
Year ended December 31 (In millions) | 2013 | 2012 | 2011
Intrinsic value (A) | $ | 1.4 |  | $ | 2.0 |  | $ | 2.2 |
Cash received from stock options exercised | 0.4 |  | 0.8 |  | 1.3 |
(A) | The difference between the market value on the date of exercise and the option exercise price.
Schedule of Share-based Compensation, Activity [Table Text Block] | A summary of the activity for the Company's performance units and restricted stock at December 31, 2013 and changes in 2013 are shown in the following table.
| Performance Units |  |
| Total Shareholder Return | Earnings Per Share | Restricted Stock
(dollars in millions) | Number of Units |  | Aggregate Intrinsic Value | Number of Units |  | Aggregate Intrinsic Value | Number of Shares | Aggregate Intrinsic Value
Units/Shares Outstanding at 12/31/12 | 1,069,128 |  |  |  | 327,838 |  |  |  | 49,106 |  |
Granted | 316,162 |  | (A) |  | 74,570 |  | (A) |  | 5,940 |  |
Modification | 87,150 |  | (B) |  | 87,170 |  | (B) |  | N/A |  |
Converted | (377,266 | ) | (C) | $ | 22.1 |  | (125,760 | ) | (C) | $ | 7.4 |  | N/A |  |
Vested | N/A |  |  |  | N/A |  |  |  | (30,242 | ) | $ | 0.9 |
Forfeited | (33,114 | ) |  |  | (9,792 | ) |  |  | (1,176 | ) |
Units/Shares Outstanding at 12/31/13 | 1,062,060 |  |  | $ | 50.9 |  | 354,026 |  |  | $ | 13.9 |  | 23,628 |  | $ | 0.8 |
Units/Shares Fully Vested at 12/31/13 | 355,078 |  |  | $ | 19.3 |  | 118,350 |  |  | $ | 8.0 |  |  |
(A) | For performance units, this represents the target number of performance units granted. Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
(B) | These amounts represent the performance unit grants previously based on earnings before interest, taxes, depreciation and amortization that were converted to performance units based on total shareholder return or earnings per share as a result of the formation of Enable.
(C) | These amounts represent performance units that vested at December 31, 2012 which were settled in February 2013.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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