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Share-Based Compensation Plans: (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock and Restricted Stock Unit Activity
Restricted stock and restricted stock unit activity for the three month period ended March 31, 2015 was as follows: 
 
 
(Thousands)
Underlying Number of
Shares
 
Weighted
Average Fair
Value
Non-vested at December 31, 2014
 
978.0

 
$
8.95

Granted
 
—

 
$
—

Vested
 
(354.6
)
 
$
9.30

Forfeited
 
(98.1
)
 
$
8.38

Non-vested at March 31, 2015
 
525.3

 
$
8.81
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
A summary of share-based compensation expense was as follows for the three month period ended March 31:
 
 
 
 
Three Months Ended
(Millions)
 
 
 
 
 
2015

 
2014

Restricted stock and restricted units
 
 
 
 
 
$
5.0

 
$
6.5

Employee savings plan (See Note 7)
 
 
 
 
 
5.6

 
7.2

Executive and management incentive compensation plans
 
4.2

 
—

Share-based compensation expense
 
 
 
 
 
$
14.8

 
$
13.7