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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, 2011
Dec. 31, 2010
Dec. 31, 2011
SERP's
Dec. 31, 2011
Defined Benefit Plans
Dec. 31, 2011
Postretirement Medical Plans
Y
sponsor
Jan. 31, 2011
Postretirement Medical Plans
Dec. 31, 2011
Supplemental Bonus Plan
Dec. 31, 2010
Supplemental Bonus Plan
Dec. 31, 2009
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 $ 0.2 $ 0.3              
Effect of 1% decrease on total service and interest cost components (0.2) (0.2)              
Effect of 1% increase on postretirement benefit obligation 1.0 2.1              
Effect of 1% decrease on postretirement benefit obligation (0.9) (1.8)              
Employee Benefits                  
Number of retiree health care plans sponsors         2        
Maximum age limit for eligibility (in years)         65        
Reduction to the benefit obligation due to amendment in terms of plan     2.9     10.1      
Average remaining years of service to full eligibility         6        
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                  
2012     1.3 3.0 1.0        
2013     1.4 3.0 0.8        
2014     2.1 3.2 0.9        
2015     2.1 3.5 0.9        
2016     2.0 3.5 0.9        
2017-2021     13.1 20.5 6.3        
Amounts in accumulated other comprehensive income that are expected to be recognized as components of net periodic benefit cost during 2012                  
Actuarial loss     1.0 1.4 0.5        
Prior service (credit) cost     (0.4) 0.2 (1.7)        
Total     0.6 1.6 (1.2)        
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             136,200    
Aggregate obligation to the plan acquired             6.6    
Expense (income) from mark to market adjustments             $ (0.2) $ 1.1 $ 3.5