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Stock-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | May 01, 2014 2014 Incentive Plan | Jun. 30, 2014 Supplemental Employee Incentive Plan IV | Jun. 30, 2013 Supplemental Employee Incentive Plan IV | Jun. 30, 2014 Supplemental Employee Incentive Plan IV | Jun. 30, 2013 Supplemental Employee Incentive Plan IV | Jun. 30, 2014 Restricted Stock Awards | Jun. 30, 2014 Restricted Stock Units | Jun. 30, 2014 Performance Share Awards Minimum | Jun. 30, 2014 Performance Share Awards Maximum | Jun. 30, 2014 Performance Share Awards Based on Internal Performance Metrics Maximum | Jun. 30, 2014 Employee Performance Share Awards | Jun. 30, 2014 Hybrid Performance Share Awards | Jun. 30, 2014 Performance Shares Based on Market Conditions Maximum | Feb. 20, 2014 TSR Performance Share Awards | Jun. 30, 2014 TSR Performance Share Awards item | May 01, 2014 Stock options 2014 Incentive Plan Maximum
Stock-based Compensation arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional shares that will be issued under any of the Company's prior plans, including the 2004 Incentive Plan | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 6.3 | $ 10.0 | $ 9.4 | $ 28.7 |  | $ 1.6 | $ 1.7 | $ 3.1 | $ 5.1 |  |  |  |  |  |  |  |  |  |  |
Tax benefits realized for stock-based compensation |  |  | 20.4 | 7.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 46,000 | 34,071 |  |  |  | 241,130 | 123,257 |  |  | 184,885 |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 34.96 | $ 38.97 |  |  |  | $ 39.43 | $ 39.43 |  |  |  |
Number of years over which performance criteria is to be met |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  | 3 years |
Annual forfeiture rate assumption (as a percent) |  |  |  |  |  |  |  |  |  | 5.00% |  | 0.00% | 5.00% |  |  |  |  |  |  |
Right to receive shares (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |
Vesting rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The 2014 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary |  |  |  |
Minimum operating cash flow for the year preceding the performance period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Right to receive additional shares (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Number of other companies in the Company's peer group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value per performance share award (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.04 |  |
Fair value per performance share award Assumptions, low end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.94 |
Fair value per performance share award Assumptions, high end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.77 |
Stock price volatility (as a percent) |  |  |  |  |  |  |  | 36.00% |  |  |  |  |  |  |  |  |  | 41.30% |  |
Stock Price Volatility, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.70% |
Stock Price Volatility, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.70% |
Risk free rate of return (as a percent) |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  | 0.70% |  |
Risk free rate of return, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |
Risk free rate of return, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% | 0.20% |
Annual salary increase rate (as a percent) |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Annual turnover rate |  |  |  |  |  |  |  | 4.60% |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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 Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant 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 (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 weighted average fair value at grant date for nonvested equity-based awards issued 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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -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 estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + 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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: 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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