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Employee Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Benefits      
Balances in deferred compensation plan $ 10.6 $ 8.7  
Value of assets for funding future payouts under the deferred compensation plan 10.1    
Change in plan assets      
Fair value of plan assets at end of year 58.9 53.1  
SERP's
      
Change in benefit obligation      
Benefit obligation at beginning of year 36.2 29.4  
Service cost 0.9 0.7 0.8
Interest cost 1.5 1.5  
Actuarial loss (gain) 3.4 5.8  
Benefits paid (1.3) (1.2)  
Benefit obligation at end of year 40.7 36.2 29.4
Funded status      
Unfunded status of the plans (40.7) (36.2)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 13.1 10.7  
Unamortized prior service (credit) cost (1.2) (1.6)  
Accumulated other comprehensive (income) loss 11.9 9.1  
Amounts recognized in the statement of financial position      
Current liabilities (1.4) (1.3)  
Noncurrent liabilities (39.3) (34.9)  
Accumulated other comprehensive (income) loss 11.9 9.1  
Net amount recognized (28.8) (27.1)  
Accumulated benefit obligation 39.3 34.5  
Components of net periodic benefit cost      
Service cost 0.9 0.7 0.8
Interest cost 1.5 1.5 1.8
Amortization of prior service credit (0.5) (0.4) (0.4)
Amortization of net loss 1.0 0.2 0.9
Net periodic benefit cost 2.9 2.0 3.1
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 4.22% 5.40% 5.99%
Rate of compensation increase (as a percent) 6.00% 6.00% 6.00%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 3.64% 4.18%  
Rate of compensation increase (as a percent) 6.00% 6.00%  
Expected employer contributions during 2013 1.4    
Defined Benefit Plans
      
Change in benefit obligation      
Benefit obligation at beginning of year 78.1 64.4  
Service cost 1.2 1.0 0.7
Interest cost 3.3 3.4  
Actuarial loss (gain) 4.4 9.8  
Change in assumptions 0.8 1.6  
Benefits paid (3.1) (2.9)  
Plan amendments 0.3 0.8  
Benefit obligation at end of year 85.0 78.1 64.4
Change in plan assets      
Fair value of plan assets at beginning of year 53.1 53.7  
Actual return on plan assets 5.9 (1.7)  
Employer contributions 3.1 4.1  
Benefits paid (3.2) (3.0)  
Fair value of plan assets at end of year 58.9 53.1 53.7
Funded status      
Unfunded status of the plans (26.1) (25.0)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 26.4 24.7  
Unamortized prior service (credit) cost 1.3 1.2  
Accumulated other comprehensive (income) loss 27.7 25.9  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (26.1) (25.0)  
Accumulated other comprehensive (income) loss 27.7 25.9  
Net amount recognized 1.6 0.9  
Accumulated benefit obligation 85.0 78.1  
Information for defined benefit plans with an accumulated benefit obligation and projected benefit obligation in excess of plan assets      
Accumulated benefit obligation 85.0 78.1  
Projected benefit obligation 85.0 78.1  
Fair value of plan assets 58.9 53.1  
Components of net periodic benefit cost      
Service cost 1.2 1.0 0.7
Interest cost 3.3 3.4 3.2
Expected return on plan assets (4.0) (4.3) (3.5)
Curtailment 0.2 0.1 0.1
Amortization of prior service credit 0.2 0.1 0.1
Amortization of net loss 1.5 0.4 0.4
Net periodic benefit cost 2.4 0.7 1.0
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 4.25% 5.29% 5.92%
Expected long-term rate of return on plan assets (as a percent) 7.43% 7.95% 8.10%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 3.89% 4.31%  
Expected long-term rate of return on plan assets (as a percent) 7.43% 7.95%  
Expected employer contributions during 2013 2.0    
Postretirement Medical Plans
      
Change in benefit obligation      
Benefit obligation at beginning of year 11.9 17.5  
Assumed in acquisition   1.8  
Service cost 0.3 0.9 0.9
Interest cost 0.4 0.9  
Actuarial loss (gain) (0.2) 1.3  
Benefits paid (0.3) (0.4)  
Plan amendments   (10.1)  
Curtailment (2.1)    
Benefit obligation at end of year 10.1 11.9 17.5
Funded status      
Unfunded status of the plans (10.1) (11.9)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 4.3 5.1  
Unamortized prior service (credit) cost (8.0) (9.7)  
Accumulated other comprehensive (income) loss (3.7) (4.6)  
Amounts recognized in the statement of financial position      
Current liabilities (0.7) (1.0)  
Noncurrent liabilities (9.3) (10.9)  
Accumulated other comprehensive (income) loss (3.7) (4.6)  
Net amount recognized (13.7) (16.5)  
Components of net periodic benefit cost      
Service cost 0.3 0.9 0.9
Interest cost 0.3 0.9 1.0
Amortization of prior service credit (1.7) (0.4)  
Amortization of net loss 0.6 0.4 0.2
Net periodic benefit cost $ (0.5) $ 1.8 $ 2.1
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.53% 5.17% 6.00%
Health care cost trend rate (as a percent) 9.50% 10.00% 10.00%
Rate to which the cost trend rate is assumed to decline (as a percent) 4.50% 4.50% 6.00%
Year that the rate reaches the ultimate trend rate 2031 2030 2014
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 2.25% 3.50%  
Health care cost trend rate assumption for next year (as a percent) 9.00% 9.50%  
Rate to which the cost trend rate is assumed to decline (as a percent) 4.25% 4.50%  
Year that the rate reaches the ultimate trend rate 2032 2031