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Employee Benefits (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
SERP's
Dec. 31, 2013
Defined Benefit Plans
Dec. 31, 2013
Postretirement Medical Plans
item
Oct. 02, 2011
Postretirement Medical Plans
Dec. 31, 2013
Supplemental Bonus Plan
Dec. 31, 2012
Supplemental Bonus Plan
Dec. 31, 2011
Supplemental Bonus Plan
Effect of one-percentage-point change in assumed health care cost trend rates                  
Effect of 1% increase on total service and interest cost components $ 0.1 $ 0.1              
Effect of 1% decrease on total service and interest cost components (0.1) (0.1)              
Effect of 1% increase on postretirement benefit obligation 0.5 0.6              
Effect of 1% decrease on postretirement benefit obligation (0.5) (0.6)              
Employee Benefits                  
Number of subsidiaries of entity         1        
Maximum age limit for eligibility         65 years        
Reduction to the benefit obligation due to amendment in terms of plan           10.1      
Average remaining years of service to full eligibility         6 years        
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods                  
2014     3.6 3.5 0.9        
2015     1.3 3.7 0.9        
2016     1.2 4.1 0.9        
2017     13.1 4.0 1.1        
2018     1.7 4.2 1.0        
2019-2023     12.4 25.2 6.3        
Amounts in accumulated other comprehensive income that are expected to be recognized as components of net periodic benefit cost during 2014                  
Actuarial loss     0.7 0.4 0.4        
Prior service (credit) cost     (0.4) 0.2 (1.7)        
Total     0.3 0.6 (1.3)        
General disclosures of the plan                  
Number of shares of the entity to be contributed to the plan as a result of acquisition             258,006    
Number of shares equivalent to the cash liability associated with post-employment liability             102,735    
Aggregate obligation to the plan acquired             7.8    
(Income) expense from mark to market adjustments             $ 1.5 $ 1.6 $ (0.2)