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Stock Based Compensation (Details 5) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |  | 0 Months Ended | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Supplemental Employee Incentive Plan | Dec. 31, 2012 Supplemental Employee Incentive Plan | Dec. 31, 2011 Supplemental Employee Incentive Plan | Dec. 31, 2013 Supplemental Employee Incentive Plan Interim trigger date | Dec. 31, 2013 Supplemental Employee Incentive Plan Final trigger date | Jun. 30, 2012 SEIP II | Feb. 11, 2013 SEIP III Interim trigger date occurs by June 30, 2014 | May 01, 2012 SEIP III Interim trigger date occurs by June 30, 2014 | Feb. 11, 2013 SEIP III Interim trigger date occurs by June 30, 2014 February 2013 Trigger Achievement | Aug. 27, 2013 SEIP III Final trigger date occurs by June 30, 2016 | Sep. 30, 2013 SEIP III Final trigger date occurs by June 30, 2016 | May 01, 2012 SEIP III Final trigger date occurs by June 30, 2016 | Dec. 31, 2013 SEIP IV | Dec. 31, 2013 SEIP IV Interim trigger date occurs by September 30, 2015 | Dec. 31, 2013 SEIP IV Final trigger date occurs by September 30, 2017 | Dec. 31, 2013 Performance Share Awards item | Dec. 31, 2012 Performance Share Awards | Dec. 31, 2011 Performance Share Awards | Feb. 28, 2014 Employee Performance Share Awards | Dec. 31, 2013 Employee Performance Share Awards item | Dec. 31, 2013 TSR Performance Share Awards
Stock-Based Compensation arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 51.8 | $ 33.5 | $ 39.5 | $ 11.5 | $ 1.4 | $ 1.2 |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.9 | $ 24.6 | $ 28.5 |  |  |
Unamortized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.0 |  |  |  |  |
Unrecognized compensation expense recognition period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.1 |  |  |  |  |
Weighted-average remaining contractual term of non-vested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Number of types of performance shares awards for which performance goal period ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Number of criteria considered for awarding performance shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Number of years over which performance criteria is to be met |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Certified achievement, grant date fair value of award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 |  | 2.9
Certified achievement, shares issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 751,780 |  | 370,784
Performance share cash award in addition to shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.3
Number of trading days during which the closing price per share of the company's common stock equals or exceeds the goal price |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which closing price per share equals or exceeds an interim price goal |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which closing price per share equals or exceeds final price goal |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of eligible employee's base salary for interim distribution |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total percentage of salary eligible for final distribution if final trigger is achieved |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental percentage of salary eligible for final distribution if company paid interim distributions upon achievement of the interim trigger |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the total distribution paid immediately |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the total distribution to be deferred in accordance with the plan |  |  |  | 75.00% |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Represents the period within which total distribution will be paid. |  |  |  | Interim or final trigger date occurs within the first 30 months from the effective date, 25% of the total distribution will be paid immediately and the remaining 75% will be deferred. Final trigger dates occurring during the last 18 months but before the end of the Plan, total distribution will be paid immediately. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments under share-based compensation plan |  |  |  | 4.5 | 0 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim goal price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25.00 | $ 25.00 |  |  |  |  |  | $ 55.00 |  |  |  |  |  |  |
Distribution to be made to company's employees due to achievement of interim goal price of $25 per share |  |  |  |  |  |  |  |  |  |  |  | 6.8 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total interim distribution paid in February |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Current distribution to be made to company's employees due to achievement of interim goal price of $25 per share |  |  |  |  |  |  |  |  |  |  |  | 1.7 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total interim distribution deferred |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |
Deferred distribution to be made to company's employees due to achievement of interim goal price of $25 per share in August 2014 |  |  |  |  |  |  |  |  |  |  |  | 5.1 |  |  |  |  |  |  |  |  |  |  |  |
Final goal price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.50 |  | $ 37.50 |  |  | $ 80.00 |  |  |  |  |  |
Distribution to be made to the company's employees due to achievement of interim goal price of $25 per share |  |  |  |  |  |  |  |  |  |  |  |  | 11.1 |  |  |  |  |  |  |  |  |  |  |
Percentage of the total distribution paid in September 2013 |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Current distribution to be made to the company's employees due to achievement of final goal price of $37.50 per share |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |
Deferred distribution to be made to the company's employees due to achievement of final goal price of $37.50 per share in August 2014 |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.3 |  |  |  |  |  |  |  |  |  |  |
Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock price volatility (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.00% |  |  |  |  |  |  |  |
Risk free rate of return (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.10% |  |  |  |  |  |  |  |
Annual salary increase rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
Annual turnover rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |  |  |  |  |  |

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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 Weighted average remaining contractual term for equity-based awards excluding options, 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 (e)(1) -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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