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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 20, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Stock-based Compensation arrangements |  |  |  |  |
Stock based compensation expense |  | $ 8.6 | $ 6.3 | $ 14.5 | $ 9.4
Tax benefits realized for stock-based compensation |  |  |  | 5.5 | 20.4
Supplemental Employee Incentive Plan IV |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Stock based compensation expense |  |  | $ 1.6 | $ (0.1) | $ 3.1
Assumptions: |  |  |  |  |
Stock price volatility |  |  |  | 30.30% |
Risk free rate of return |  |  |  | 0.70% |
Annual salary increase rate |  |  |  | 4.00% |
Annual turnover rate |  |  |  | 4.60% |
Restricted Stock Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 3,400 |
Granted (in dollars per share) |  |  |  | $ 28.55 |
Annual forfeiture rate assumption (as a percent) |  |  |  | 5.00% |
Restricted Stock Units |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 47,320 |
Granted (in dollars per share) |  |  |  | $ 27.96 |
Performance Share Awards | Minimum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 0.00% |
Performance Share Awards | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 5.00% |
Performance Share Awards Based on Internal Performance Metrics | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Right to receive additional shares, (as a percent) |  |  |  | 100.00% |
Employee Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 349,780 |
Granted (in dollars per share) |  |  |  | $ 27.71 |
Number of years over which performance criteria is to be met |  |  |  | 3 years |
Hybrid Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 194,947 |
Granted (in dollars per share) |  |  |  | $ 27.71 |
Vesting rights |  |  |  | The 2015 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 |  |  |  | $ 100.0 |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on each of the first and second anniversary |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Award vesting rights, percentage |  | 25.00% |  |  |
Hybrid Performance Share Awards | Hybrid performance share awards, percentage vesting on the third anniversary |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Award vesting rights, percentage |  | 50.00% |  |  |
Performance Shares Based on Market Conditions | Maximum |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Right to receive shares (as a percent) |  |  |  | 100.00% |
Right to receive an additional award in cash (as a percent) |  |  |  | 100.00% |
TSR Performance Share Awards |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |
Granted (in shares) |  |  |  | 292,421 |
Performance period |  |  |  | 3 years |
Assumptions: |  |  |  |  |
Fair value per performance share award (in dollars per share) | $ 19.29 |  |  |  |
Stock price volatility | 32.30% |  |  |  |
Risk free rate of return | 1.00% |  |  |  |
Expected dividend yield | 0.30% |  |  | 0.30% |
Stock price volatility, minimum |  |  |  | 25.60% |
Stock price volatility, maximum |  |  |  | 29.00% |
Risk free rate of return, minimum |  |  |  | 0.10% |
Risk free rate of return, maximum |  |  |  | 0.80% |
Fair value per performance share award, minimum (in dollars per share) |  |  |  | $ 14.60 |
Fair value per performance share award, maximum(in dollars per share) |  |  |  | $ 19.30 |

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- Definition High end of range of the weighted average fair value for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Low end of range of the weighted average fair value for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Represents the annual salary increase rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The rate of forfeitures assumptions that is used in calculating the fair values of a share-based compensation award. + References No definition available. + Details
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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 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 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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