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Stock-Based Compensation Plans and Employee Benefits (Restricted Stock Units Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 Restricted stock units | Dec. 31, 2012 Restricted stock units | Dec. 31, 2011 Restricted stock units | Dec. 31, 2013 Performance-based restricted stock units | Dec. 31, 2013 Performance based restricted stock units vesting on December 31, 2014 | Dec. 31, 2013 Employees Restricted stock units | Dec. 31, 2013 Employees Amended restricted stock units that vested on January 1, 2012 | Feb. 28, 2013 Employees Service based restricted stock units vesting on February 11, 2013 | Dec. 31, 2013 Employees Annual incentive restricted stock units | Feb. 28, 2013 Employees Annual incentive restricted stock units | Dec. 31, 2013 Employees Performance-based restricted stock units | Dec. 31, 2013 Employees Service based restricted stock units with specified vesting dates | Dec. 31, 2013 Company's chairman and chief executive officer Restricted stock units | Dec. 31, 2013 Company's chairman and chief executive officer Performance-based restricted stock units | Dec. 31, 2013 Company's chairman and chief executive officer Service-based restricted stock units | Sep. 30, 2011 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 | Dec. 31, 2013 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 | Dec. 31, 2013 Minimum Employees Performance-based restricted stock units | Dec. 31, 2013 Minimum Employees Service-based restricted stock units | Dec. 31, 2013 Minimum Employees Service based restricted stock units with specified vesting dates | Dec. 31, 2013 Maximum Employees Performance-based restricted stock units | Dec. 31, 2013 Maximum Employees Service-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock units vested |  | $ 31.6 | $ 29.1 | $ 15.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) | 1,678,961 | 3,271,000 |  |  |  |  | 3,271,272 | 1,719,304 |  | 195,588 | 164,685 |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 795,000 |  |  |  |  |  |  | 185,720 |  |  |  |  | 600,000 | 313,334 |  |  |  |  |  |  |  |
Non-vested, outstanding (in shares) |  | 2,779,000 | 5,276,000 |  |  | 195,547 |  |  |  |  |  | 195,588 | 90,666 |  |  | 600,000 |  | 1,696,053 |  |  |  |  | 196,902
Performance measurement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  | 2 years |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  | 200.00% |
Percentage of original units granted equal to amended units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
Risk-free interest rate |  |  |  |  | 0.26% |  |  |  |  |  |  |  |  |  |  |  |  | 0.092% |  |  |  |  |
Expected stock price volatility |  |  |  |  | 50.44% |  |  |  |  |  |  |  |  |  |  |  |  | 57.75% |  |  |  |  |
Vesting term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years |  | 3 years

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- Definition Represents the percentage applied to original units granted to determine the amended units in the situation where the minimum stock price, as defined in the plan, is not achieved by a certain date. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Measurement Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Percentage + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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