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Stock-Based Compensation (Details) (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 | Dec. 31, 2010
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) | $ 14.9 | $ 16.4 | $ 15.0 |
Number of share options granted during the period (in shares) | 400,000 | 700,000 |  |
Exercise Price, low end of range | $ 4.41 |  |  |
Exercise Price, high end of range | $ 47.84 |  |  |
Unrecognized compensation expense (in dollars) | 9.3 |  |  |
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of common stock authorized under the plan | 8,000,000 |  |  |
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) | 6.3 | 6.7 | 6.9 |
Number of share options granted during the period (in shares) | 400,000 | 700,000 |  | 1,000,000
Stock-based compensation expense, net of tax (in dollars) | 4.0 | 4.2 | 4.3 |
Unrecognized compensation expense (in dollars) | 7.0 |  |  |
Recognition period for unrecognized compensation expense (in years) | 2 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 9.00 | $ 7.97 |  | $ 9.66
Total intrinsic value of stock options exercised | 6.9 | 4.9 | 2.8 |
Stock Options | Directors |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights, annual increments beginning on the grant date | 0.25 |  |  |
Anniversary period from grant date, for grants made prior to 2011 (in years) | P1Y |  |  |
Expiration period | 10 years |  |  |
Vesting period (in years) | 4 years |  |  |
Stock Options | Officers and Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights, annual increments beginning on the grant date | 25% increments beginning on the first anniversary of the grant date |  |  |
Vesting Rights Percentage | 25.00% |  |  |
Vesting rights percentage for grants made prior to 2011 (as a percent) | 25.00% |  |  |
Anniversary period from grant date, for grants made prior to 2011 (in years) | P2Y |  |  |
Vesting period for grants made prior to 2011 (in years) | 4 years |  |  |
Expiration period for grants made prior to 2011 (in years) | 10 years |  |  |
Stock Options | Stock Plan 2003 | Officers and Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights, annual increments beginning on the grant date | 25% increments beginning on the second anniversary of the grant date |  |  |
Vesting Rights Percentage | 25.00% |  |  |
Anniversary period from grant date (in years) | P2Y |  |  |
Expiration period | 10 years |  |  |
Vesting period (in years) | 4 years |  |  |
Stock Options | Director Stock Plan 2004 | Directors |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period | 10 years |  |  |
Restricted Stock |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period | 3 years |  |  |
Stock-based compensation expense (in dollars) | 2.8 | 4.5 | 4.0 |
Stock-based compensation expense, net of tax (in dollars) | 1.8 | 2.8 | 2.5 |
Unrecognized compensation expense (in dollars) | 1.6 |  |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 5 months 6 days |  |  |
Granted, shares | 100,000.0 | 200,000.0 | 300,000.0 |
Restricted Stock | Officers and Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights percentage for grants made prior to 2011 (as a percent) | 25.00% |  |  |
Restricted Stock | Stock Plan 2003 | Officers and Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights, annual increments beginning on the grant date | 100% on the third anniversary of the grant date |  |  |
Vesting Rights Percentage | 100.00% |  |  |
Expiration period | 3 years |  |  |
Restricted Stock | Director Stock Plan 2004 | Directors |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period | 3 years |  |  |
Performance shares |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) | 5.8 | 5.2 | 4.1 |
Stock-based compensation expense, net of tax (in dollars) | $ 3.6 | $ 3.3 | $ 2.6 |
Recognition period for unrecognized compensation expense (in years) | 1 year 9 months 24 days |  |  |
Granted, shares | 500,000.0 | 300,000.0 | 400,000.0 |
Performance shares | Performance Shares 2013 [Member] |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group of companies | 50.00% |  |  |
Percentage of shares paid based on improvement in total leverage ratio | 50.00% |  |  |
Performance shares | Performance Shares 2013 [Member] | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 0.0 |  |  |
Performance shares | Performance Shares 2013 [Member] | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 800,000.0 |  |  |
Performance shares | Performance Shares 2012 |  |  |  |
Stock-Based Compensation |  |  |  |
Period for meeting performance goals (in years) | 3 years |  |  |
Percentage of shares paid based on total shareholder return relative to peer group of companies | 50.00% |  |  |
Percentage of shares paid based on improvement in total leverage ratio | 50.00% |  |  |
Performance shares | Performance Shares 2012 | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 0 |  |  |
Performance shares | Performance Shares 2012 | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 700,000.0 |  |  |
Performance shares | Performance Shares 2011 |  |  |  |
Stock-Based Compensation |  |  |  |
Period for meeting performance goals (in years) | 2 years |  |  |
Percentage of shares paid based on total shareholder return relative to peer group of companies | 50.00% |  |  |
Percentage of shares paid based on improvement in total leverage ratio | 50.00% |  |  |
Percentage of shares paid after employment of entire second calendar year | 25.00% |  |  |
Percentage of shares paid after two year performance period | 75.00% |  |  |
Percentage of vesting rights on the third anniversary of grant date (as a percent) | 25.00% |  |  |
ShareBasedCompensationArrangementByShareBasedPaymentTotalAwardSharesThatWillBeIssued | 500,000 |  |  |
Performance shares | Performance Shares 2011 | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 0 |  |  |
Performance shares | Performance Shares 2011 | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Granted, shares | 900,000.0 |  |  |
Range of Exercise Price $36.04 - $47.84 |  |  |  |
Stock-Based Compensation |  |  |  |
Exercise Price, low end of range | $ 36.04 |  |  |
Exercise Price, high end of range | $ 47.84 |  |  |
Range of Exercise Price $4.41 - $7.49 |  |  |  |
Stock-Based Compensation |  |  |  |
Exercise Price, low end of range | $ 4.41 |  |  |
Exercise Price, high end of range | $ 7.49 |  |  |

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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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