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Employee Benefits - Summary of SERPs and Defined Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits      
Balances in Deferred Compensation Plan $ 21.2 $ 16.6  
Value of assets for funding future payouts under the deferred compensation plan 20.2    
Contributions to Multiemployer Plans 5.4 5.3 $ 5.2
Change in plan assets      
Fair value of plan assets at beginning of year 73.3    
Fair value of plan assets at end of year 89.0 73.3  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (85.4) (89.6)  
Supplemental Executive Retirement Plans      
Change in benefit obligation      
Benefit obligation at beginning of year 48.5 49.4  
Service cost 0.8 1.1 1.0
Interest cost 1.1 1.6  
Actuarial loss 1.0 1.1  
Benefits paid (1.2) (1.3)  
Plan settlements (13.6) (3.4)  
Benefit obligation at end of year 36.6 48.5 49.4
Funded status      
Funded status of the plans (36.6) (48.5)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 10.3 14.1  
Accumulated other comprehensive loss 10.3 14.1  
Amounts recognized in the statement of financial position      
Current liabilities (1.2) (14.8)  
Noncurrent liabilities (35.4) (33.7)  
Accumulated other comprehensive loss 10.3 14.1  
Net amount recognized (26.3) (34.4)  
Accumulated benefit obligation 32.6 44.2  
Components of net periodic benefit cost      
Service cost 0.8 1.1 1.0
Interest cost 1.1 1.6 1.3
Settlement loss 3.7 1.0  
Prior service (credit) cost     (0.3)
Amortization of net loss 0.9 1.4 1.5
Net periodic benefit cost $ 6.5 $ 5.1 $ 3.5
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.36% 3.45% 3.02%
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) 3.04% 3.34%  
Rate of compensation increase (as a percent) 6.00% 6.00%  
Expected employer contributions during 2018 $ 1.2    
Defined Benefit Plans      
Change in benefit obligation      
Benefit obligation at beginning of year 95.9 $ 96.3  
Service cost 1.5 1.6 $ 1.7
Interest cost 3.7 3.9  
Actuarial loss 6.2 0.6  
Benefits paid (3.8) (6.1)  
Plan amendments 0.2    
Plan settlements (0.2) (0.4)  
Benefit obligation at end of year 103.5 95.9 96.3
Change in plan assets      
Fair value of plan assets at beginning of year 73.3 70.2  
Actual return on plan assets 9.9 3.9  
Employer contributions 9.8 5.5  
Benefits paid (4.0) (6.3)  
Fair value of plan assets at end of year 89.0 73.3 70.2
Funded status      
Funded status of the plans (14.5) (22.6)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 24.5 25.4  
Unamortized prior service cost 2.1 2.3  
Accumulated other comprehensive loss 26.6 27.7  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (14.5) (22.6)  
Accumulated other comprehensive loss 26.6 27.7  
Net amount recognized 12.1 5.1  
Accumulated benefit obligation 103.5 95.9  
Information for defined benefit plans with an accumulated benefit obligation and projected benefit obligation in excess of plan assets      
Accumulated benefit obligation 75.5 95.9  
Projected benefit obligation 75.5 95.9  
Fair value of plan assets 60.3 73.3  
Components of net periodic benefit cost      
Service cost 1.5 1.6 1.7
Interest cost 3.7 3.9 3.7
Expected return on plan assets (4.4) (4.6) (5.0)
Settlement loss 0.1 0.1  
Prior service (credit) cost 0.3 0.3 0.2
Amortization of net loss 1.5 1.5 1.8
Net periodic benefit cost $ 2.7 $ 2.8 $ 2.4
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.93% 4.13% 3.87%
Expected long-term rate of return on plan assets (as a percent) 6.17% 6.57% 6.59%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 3.47% 3.93%  
Expected long-term rate of return on plan assets (as a percent) 6.17% 6.57%  
Expected employer contributions during 2018 $ 1.6    
Warehouse, delivery, selling, general and administrative expense | Supplemental Executive Retirement Plans      
Components of net periodic benefit cost      
Net periodic benefit cost 0.8 $ 1.1 $ 1.0
Warehouse, delivery, selling, general and administrative expense | Defined Benefit Plans      
Components of net periodic benefit cost      
Net periodic benefit cost 1.5 1.6 1.7
Other expenses, net | Supplemental Executive Retirement Plans      
Components of net periodic benefit cost      
Net periodic benefit cost 5.7 4.0 2.5
Other expenses, net | Defined Benefit Plans      
Components of net periodic benefit cost      
Net periodic benefit cost $ 1.2 $ 1.2 $ 0.7