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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Long-Term Incentive Plan
Sep. 30, 2014
Stock Options
Long-Term Incentive Plan
Sep. 30, 2014
Restricted stock units
Sep. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Sep. 30, 2013
Restricted stock units
Long-Term Incentive Plan
Sep. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Sep. 30, 2013
Restricted stock units
Long-Term Incentive Plan
Sep. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Personnel Accruals
Dec. 31, 2013
Restricted stock units
Long-Term Incentive Plan
Personnel Accruals
Sep. 30, 2014
Restricted stock units
Long-Term Incentive Plan
Certain executive officers
Sep. 30, 2014
Performance Unit Awards
Long-Term Incentive Plan
Sep. 30, 2014
Performance Unit Awards
Long-Term Incentive Plan
Jul. 15, 2014
Performance Unit Awards
Long-Term Incentive Plan
Sep. 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   $ 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           $ 2.1   $ 2.1                
Weighted-average period for amortization of unrecognized compensation cost               0 years 6 months                
Compensation expense           0.7 3.0 2.2 12.1       0.1 3.8    
Share-based Compensation Paid Performance Unit Awards                             3.9  
Liability for unvested restricted share awards $ 49.5 $ 45.8               $ 11.0 $ 8.9         $ 3.8