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Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended
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Jun. 30, 2013 years | Dec. 31, 2012 | Jun. 30, 2013 Director [Member] | Jun. 30, 2013 Stock Options [Member] Director [Member] | Jun. 30, 2013 Options and SSARs [Member] | Jun. 30, 2013 Options and SSARs [Member] | Jun. 30, 2013 Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |
Options / SSARs outstanding at January 1, 2012 | 8,475,000 |  |  |  |  |  |
Incentive shares granted | 343,000 |  |  |  |  |  |
Options / SSARs exercised | (1,854,000) |  |  |  |  |  |
Options / SSARs cancelled | 0 |  |  |  |  |  |
Options / SSARs outstanding at September 30, 2012 | 6,964,000 |  |  |  |  |  |
Options / SSARs outstanding Weighted Average Exercise Price | $ 14.28 | $ 12.88 |  |  |  |  |
SSARs granted Weighted Average Exercise Price | $ 20.49 |  |  |  |  |  |
Options / SSARs exercised Weighted Average Exercise Price | $ 9.03 |  |  |  |  |  |
Options / SSARs cancelled Weighted Average Exercise Price | $ 0.00 |  |  |  |  |  |
Options / SSARs outstanding Weighted Average Contractual Term (in years) | 5.4 |  |  |  |  |  |
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) | $ 25.5 |  |  |  |  |  |
Vested and expected to vest | 6,615,000 |  |  |  |  |  |
Vested and expected to vest Aggregate Intrinsic Value (in millions) | 24.2 |  |  |  |  |  |
Options / SSARs exercisable | 5,711,000 |  |  |  |  |  |
Options / SSARs exercisable Weighted Average Exercise Price | $ 14.74 |  |  |  |  |  |
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) | 20.3 |  |  |  |  |  |
Weighted-average period of years costs are expected to be recognied over |  |  |  |  | 1 year 8 months 12 days |  |
Compensation Expense |  |  |  |  |  | 1.7 |
Unrecognized compensation costs |  |  |  |  | $ 5.9 | $ 5.9 |
Vesting Period |  |  |  |  |  |  | 3 years
Starting Term When Options Become Exercisable After Grant Date |  |  | 3 months |  |  |  |
Number of Shares Available for Grant |  |  |  |  | 5,600,000 | 5,600,000 |
Number of months for options to vest at an incremental rate of ten percent for directors |  |  |  | 3 months |  |  |

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