Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2014
|
Dec. 31, 2013
|
Jun. 30, 2014
Long-Term Incentive Plan
|
Jun. 30, 2014
Stock Options
Long-Term Incentive Plan
|
Jun. 30, 2014
Restricted stock units
|
Jun. 30, 2014
Restricted stock units
Long-Term Incentive Plan
|
Jun. 30, 2013
Restricted stock units
Long-Term Incentive Plan
|
Jun. 30, 2014
Restricted stock units
Long-Term Incentive Plan
|
Jun. 30, 2013
Restricted stock units
Long-Term Incentive Plan
|
Apr. 19, 2012
Restricted stock units
Long-Term Incentive Plan
|
Jun. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Personnel Accruals
|
Dec. 31, 2013
Restricted stock units
Long-Term Incentive Plan
Personnel Accruals
|
Jun. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Certain executive officers
|
Jun. 30, 2014
Performance Unit Awards
Long-Term Incentive Plan
|
Jun. 30, 2014
Performance Unit Awards
Long-Term Incentive Plan
|
Jun. 30, 2014
Performance Unit Awards
Long-Term Incentive Plan
Personnel Accruals
|
|
Share-Based Compensation | ||||||||||||||||
Common stock authorized for issuance (in shares) | 7,500,000 | 1,000,000 | ||||||||||||||
Offer price per share received as cash settlement on restricted stock awards vested in 2012 | $ 30.00 | |||||||||||||||
Vesting period | 3 years | 1 year | ||||||||||||||
Vesting rights percentage | 33.33% | |||||||||||||||
Number of shares, right to receive cash payment equal to fair value of which is received per unit on vesting of award | 1 | |||||||||||||||
Unrecognized compensation cost | $ 2.9 | $ 2.9 | ||||||||||||||
Weighted-average period for amortization of unrecognized compensation cost | 9 months 18 days | |||||||||||||||
Compensation expense | 0.9 | 3.7 | 1.5 | 9.1 | 1.9 | 3.6 | ||||||||||
Liability for unvested restricted share awards | $ 43.7 | $ 45.8 | $ 10.3 | $ 8.9 | $ 7.6 |