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Stock-Based Compensation Plans - Other Than Options (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jan. 25, 2013
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2013
Performance Based Restricted Stock [Member]
Dec. 31, 2013
Market Based Restricted Stock [Member]
Shares (in shares)              
Granted (in shares)     1,000 1,000 1,024 125 125
Forfeited (in shares)         (119) (14) (14)
Vested (in shares)         0 0 0
Shares outstanding at December 31, 2013         905 111 111
Weighted average per share (in dollars per share)              
Granted (in dollars per share)     $ 19   $ 19.01 $ 23.58 $ 25.91
Forfeited (in dollars per share)         $ 19.00 $ 23.58 $ 25.91
Vested (in dollars per share)         $ 0.00 $ 0.00 $ 0.00
Shares outstanding at December 31, 2013 (in dollars per share)         $ 19.01 $ 23.58 $ 25.91
Tax benefit related to compensation expense $ 0.9 $ 0.2