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Stock Based Compensation (Details 4) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
General information on stock-based compensation |  |  |
Stock based compensation expense | $ 51.8 | $ 33.5 | $ 39.5
Performance Share Awards |  |  |
Stock-Based Compensation arrangements |  |  |
Number of types of performance awards granted to employees | 3 |  |
Performance period | 3 years |  |
General information on stock-based compensation |  |  |
Stock based compensation expense | 30.9 | 24.6 | 28.5
Performance Share Awards | Low end of range |  |  |
Stock-Based Compensation arrangements |  |  |
Annual forfeiture rate assumption (as a percent) | 0.00% |  |
Performance Share Awards | High end of range |  |  |
Stock-Based Compensation arrangements |  |  |
Annual forfeiture rate assumption (as a percent) | 7.00% |  |
Performance shares based on performance conditions |  |  |
Stock-Based Compensation arrangements |  |  |
Number of types of performance awards granted to employees | 2 |  |
Performance shares based on performance conditions | High end of range |  |  |
Stock-Based Compensation arrangements |  |  |
Right to receive shares (as a percent) | 100.00% |  |
Employee Performance Share Awards |  |  |
Stock-Based Compensation arrangements |  |  |
Vesting rights | An employee will earn one-third of the award for each of the three performance metrics that the Company meets |  |
Number of criteria considered for awarding performance shares | 3 |  |
Number of years over which performance criteria is to be met | 3 years |  |
Shares or units |  |  |
Outstanding at beginning of year (in shares) | 1,919,640 | 2,627,900 | 2,497,040
Granted (in shares) | 379,540 | 567,360 | 837,460
Issued and Fully Vested (in shares) | (610,960) | (1,189,920) | (575,200)
Forfeited (in shares) | (30,240) | (85,700) | (131,400)
Outstanding at the end of the period (in shares) | 1,657,980 | 1,919,640 | 2,627,900
Weighted-Average Grant Date Fair Value per Share |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 12.27 | $ 8.12 | $ 8.35
Granted (in dollars per share) | $ 26.62 | $ 17.59 | $ 10.19
Issued and Fully Vested (in dollars per share) | $ 10.13 | $ 5.66 | $ 12.12
Forfeited (in dollars per share) | $ 17.06 | $ 12.11 | $ 8.10
Outstanding at the end of the period (in dollars per share) | $ 16.25 | $ 12.27 | $ 8.12
Hybrid Performance Share Awards |  |  |
Stock-Based Compensation arrangements |  |  |
Vesting rights | The 2013 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary and the 2012 and 2011 awards vest one-third on each anniversary date |  |
Performance period | 3 years |  |
Minimum operating cash flow for the year preceding the performance period | 100 |  |
Shares or units |  |  |
Outstanding at beginning of year (in shares) | 592,162 | 759,328 | 763,576
Granted (in shares) | 169,980 | 234,922 | 370,784
Issued and Fully Vested (in shares) | (311,930) | (402,088) | (375,032)
Outstanding at the end of the period (in shares) | 450,212 | 592,162 | 759,328
Weighted-Average Grant Date Fair Value per Share |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 13.11 | $ 9.16 | $ 8.25
Granted (in dollars per share) | $ 26.62 | $ 17.59 | $ 10.19
Issued and Fully Vested (in dollars per share) | $ 12.03 | $ 8.27 | $ 8.32
Outstanding at the end of the period (in dollars per share) | $ 18.96 | $ 13.11 | $ 9.16
Performance shares based on market conditions |  |  |
Stock-Based Compensation arrangements |  |  |
Number of types of performance awards granted to employees | 1 |  |
TSR Performance Share Awards |  |  |
Stock-Based Compensation arrangements |  |  |
Performance period | 3 years |  |
Shares or units |  |  |
Outstanding at beginning of year (in shares) | 605,706 | 1,495,904 | 1,415,168
Granted (in shares) | 254,980 | 234,922 | 370,784
Issued and Fully Vested (in shares) |  | (1,125,120) | (290,048)
Outstanding at the end of the period (in shares) | 860,686 | 605,706 | 1,495,904
Weighted-Average Grant Date Fair Value per Share |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 10.27 | $ 6.07 | $ 6.50
Granted (in dollars per share) | $ 23.06 | $ 14.16 | $ 7.81
Issued and Fully Vested (in dollars per share) |  | $ 5.49 | $ 10.38
Outstanding at the end of the period (in dollars per share) | $ 14.06 | $ 10.27 | $ 6.07
TSR Performance Share Awards | Equity Component |  |  |
Assumptions |  |  |
Fair value per performance share award at the end of the period | $ 23.06 | $ 14.16 | $ 7.81
Stock price volatility (as a percent) | 43.80% | 46.70% | 62.00%
Risk free rate of return (as a percent) | 0.40% | 0.40% | 1.30%
Expected dividend yield (as a percent) | 0.20% | 0.20% | 0.20%
TSR Performance Share Awards | Liability Component |  |  |
General information on stock-based compensation |  |  |
Non-current portion of the liability , included in Other Liabilities | 7.8 | 7.6 |
Current portion of the liability, included in Other Liabilities | 14.3 | 0 |
Cash payment |  | $ 18.4 |
Assumptions |  |  |
Stock Price Volatility, low end of range (as a percent) | 30.20% | 41.10% | 41.90%
Stock Price Volatility, high end of range (as a percent) | 35.90% | 45.70% | 42.70%
Risk free rate of return, low end of range (as a percent) | 0.10% | 0.20% | 0.10%
Risk free rate of return, high end of range (as a percent) | 0.40% | 0.30% | 0.30%
Expected dividend yield (as a percent) | 0.20% | 0.20% | 0.20%
TSR Performance Share Awards | Low end of range |  |  |
Stock-Based Compensation arrangements |  |  |
Number of other companies in the Company's peer group | 15 |  |
TSR Performance Share Awards | Low end of range | Liability Component |  |  |
Assumptions |  |  |
Fair value per performance share award at the end of the period | $ 23.96 | $ 19.11 | $ 12.82
TSR Performance Share Awards | High end of range |  |  |
Stock-Based Compensation arrangements |  |  |
Right to receive shares (as a percent) | 100.00% |  |
Number of other companies in the Company's peer group | 16 |  |
Weighted-Average Grant Date Fair Value per Share |  |  |
Right to receive additional shares (as a percent) | 100.00% |  |
TSR Performance Share Awards | High end of range | Liability Component |  |  |
Assumptions |  |  |
Fair value per performance share award at the end of the period | $ 38.61 | $ 24.76 | $ 17.74

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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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