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Employee Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Benefits      
Balances in deferred compensation plan $ 11.7 $ 10.6  
Value of assets for funding future payouts under the deferred compensation plan 11.1    
Change in plan assets      
Fair value of plan assets at end of year 70.2 58.9  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (84.0) (94.9)  
SERP's
      
Change in benefit obligation      
Benefit obligation at beginning of year 40.7 36.2  
Service cost 0.9 0.9 0.7
Interest cost 1.5 1.5  
Actuarial (gain) loss (3.1) 3.4  
Benefits paid (1.3) (1.3)  
Benefit obligation at end of year 38.7 40.7 36.2
Funded status      
Funded status of the plans (38.7) (40.7)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 8.8 13.1  
Unamortized prior service (credit) cost (0.7) (1.2)  
Accumulated other comprehensive (income) loss 8.1 11.9  
Amounts recognized in the statement of financial position      
Current liabilities (3.6) (1.4)  
Noncurrent liabilities (35.1) (39.3)  
Accumulated other comprehensive (income) loss 8.1 11.9  
Net amount recognized (30.6) (28.8)  
Accumulated benefit obligation 38.7 39.3  
Components of net periodic benefit cost      
Service cost 0.9 0.9 0.7
Interest cost 1.5 1.5 1.5
Prior service (credit) cost (0.5) (0.5) (0.4)
Amortization of net loss 1.3 1.0 0.2
Net periodic benefit cost 3.2 2.9 2.0
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.73% 4.22% 5.40%
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) 4.05% 3.64%  
Rate of compensation increase (as a percent) 6.00% 6.00%  
Expected employer contributions during 2014 3.6    
Defined Benefit Plans
      
Change in benefit obligation      
Benefit obligation at beginning of year 85.0 78.1  
Assumed in acquisition 3.5    
Service cost 1.4 1.2 1.0
Interest cost 3.4 3.3  
Actuarial (gain) loss (7.3) 4.4  
Change in assumptions (1.4) 0.8  
Benefits paid (2.9) (3.1)  
Plan amendments 0.3 0.3  
Benefit obligation at end of year 82.0 85.0 78.1
Change in plan assets      
Fair value of plan assets at beginning of year 58.9 53.1  
Acquired in acquisition 2.5    
Actual return on plan assets 9.7 5.9  
Employer contributions 2.0 3.1  
Benefits paid (2.9) (3.2)  
Fair value of plan assets at end of year 70.2 58.9 53.1
Funded status      
Funded status of the plans (11.8) (26.1)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 10.5 26.4  
Unamortized prior service (credit) cost 1.5 1.3  
Accumulated other comprehensive (income) loss 12.0 27.7  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (11.8) (26.1)  
Accumulated other comprehensive (income) loss 12.0 27.7  
Net amount recognized 0.2 1.6  
Accumulated benefit obligation 80.6 85.0  
Information for defined benefit plans with an accumulated benefit obligation and projected benefit obligation in excess of plan assets      
Accumulated benefit obligation 80.6 85.0  
Projected benefit obligation 80.6 85.0  
Fair value of plan assets 68.9 58.9  
Components of net periodic benefit cost      
Service cost 1.4 1.2 1.0
Interest cost 3.4 3.3 3.4
Expected return on plan assets (4.4) (4.0) (4.3)
Curtailment/settlement expense   0.2 0.1
Prior service (credit) cost 0.2 0.2 0.1
Amortization of net loss 1.8 1.5 0.4
Net periodic benefit cost 2.4 2.4 0.7
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 4.00% 4.25% 5.29%
Expected long-term rate of return on plan assets (as a percent) 7.30% 7.43% 7.95%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 4.70% 3.89%  
Expected long-term rate of return on plan assets (as a percent) 7.30% 7.43%  
Expected employer contributions during 2014 3.7    
Postretirement Medical Plans
      
Change in benefit obligation      
Benefit obligation at beginning of year 10.1 11.9  
Service cost 0.2 0.4 0.9
Interest cost 0.2 0.4  
Actuarial (gain) loss (0.4) (0.2)  
Benefits paid (0.2) (0.3)  
Curtailment   (2.1)  
Benefit obligation at end of year 9.9 10.1 11.9
Funded status      
Funded status of the plans (9.9) (10.1)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 3.4 4.3  
Unamortized prior service (credit) cost (6.3) (8.0)  
Accumulated other comprehensive (income) loss (2.9) (3.7)  
Amounts recognized in the statement of financial position      
Current liabilities (0.7) (0.7)  
Noncurrent liabilities (9.2) (9.3)  
Accumulated other comprehensive (income) loss (2.9) (3.7)  
Net amount recognized (12.8) (13.7)  
Components of net periodic benefit cost      
Service cost 0.2 0.4 0.9
Interest cost 0.2 0.3 0.9
Prior service (credit) cost (1.7) (1.7) (0.4)
Amortization of net loss 0.6 0.6 0.4
Net periodic benefit cost $ (0.7) $ (0.5) $ 1.8
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 2.25% 3.53% 5.17%
Health care cost trend rate (as a percent) 9.00% 9.50% 10.00%
Rate to which the cost trend rate is assumed to decline (as a percent) 4.25% 4.50% 4.50%
Year that the rate reaches the ultimate trend rate 2032 2031 2030
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 3.10% 2.25%  
Health care cost trend rate assumption for next year (as a percent) 9.00% 9.00%  
Rate to which the cost trend rate is assumed to decline (as a percent) 4.25% 4.25%  
Year that the rate reaches the ultimate trend rate 2033 2032