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Share-Based Payments (General Descriptions) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
plan
$ / shares
Jun. 30, 2014
USD ($)
Mar. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Jun. 20, 2008
$ / shares
shares
Jun. 25, 2004
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of plans | plan     2          
Expiration period of awards     10 years          
Period in force, from which option holders may elect to sell back acquired shares     90 days          
Pre-tax compensation cost (benefit) recognized $ (0.8) $ 0.8 $ (1.6) $ 2.5        
Compensation cost (benefit), tax expense (benefit) 0.3 $ (0.3) (0.6) $ 0.8        
Compensation cost related to nonvested options not yet recognized $ 1.8   $ 1.8          
Weighted average period over which the compensation is expected to be recognized     2 years          
Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, par value | $ / shares $ 1.00   $ 1.00   $ 1.00 $ 1 $ 1.00 $ 1.00
Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual vesting percentage     20.00%          
Requisite service period of awards     1 year          
Employees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual vesting percentage     20.00%          
Requisite service period of awards     3 years          
1995 Plan [Member] | Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based payments, number of shares authorized under plans | shares               300,000
2008 Plan [Member] | Common Class A [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based payments, number of shares authorized under plans | shares             300,000