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Employee Benefits - Summary of SERPs and Defined Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Benefits |  |  |
Balances in Deferred Compensation Plan | $ 31.4 | $ 21.8 |
Value of assets for funding future payouts under the deferred compensation plan | 26.5 | 21.1 |
Contributions to Multiemployer Plans | 5.7 | 5.4 | $ 5.4
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 94.9 |  |
Fair value of plan assets at end of year | 107.1 | 94.9 |
Amounts recognized in the statement of financial position |  |  |
Noncurrent liabilities | (87.0) | (71.8) |
SERPs |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 37.2 | 36.6 |
Service cost | 0.9 | 0.9 | 0.8
Interest cost | 1.4 | 1.1 | 1.1
Actuarial loss (gain) | 11.4 | (0.3) |
Benefits paid | (1.1) | (1.1) |
Benefit obligation at end of year | 49.8 | 37.2 | 36.6
Funded status |  |  |
Funded status of the plans | (49.8) | (37.2) |
Items not yet recognized as component of net periodic pension expense |  |  |
Unrecognized net actuarial losses | 19.6 | 9.1 |
Accumulated other comprehensive loss | 19.6 | 9.1 |
Amounts recognized in the statement of financial position |  |  |
Current liabilities | (17.5) | (1.1) |
Noncurrent liabilities | (32.3) | (36.1) |
Accumulated other comprehensive loss | 19.6 | 9.1 |
Net amount recognized | (30.2) | (28.1) |
Accumulated benefit obligation | 42.0 | 32.5 |
Components of net periodic benefit cost |  |  |
Service cost | 0.9 | 0.9 | 0.8
Interest cost | 1.4 | 1.1 | 1.1
Settlement loss |  |  | 3.7
Amortization of net loss | 1.0 | 0.9 | 0.9
Net periodic benefit cost | $ 3.3 | $ 2.9 | $ 6.5
Weighted average assumptions to determine net cost |  |  |
Discount rate (as a percent) | 3.81% | 3.04% | 3.36%
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) | 2.63% | 3.82% |
Rate of compensation increase (as a percent) | 6.00% | 6.00% |
Expected employer contributions during 2020 | $ 17.5 |  |
Defined Benefit Plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of year | 96.6 | $ 103.5 |
Service cost | 1.6 | 1.7 | $ 1.5
Interest cost | 3.8 | 3.5 | 3.7
Actuarial loss (gain) | 15.9 | (9.3) |
Benefits paid | (3.9) | (3.8) |
Plan amendments | 2.2 | 1.0 |
Benefit obligation at end of year | 116.2 | 96.6 | 103.5
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 94.9 | 89.0 |
Actual return on plan assets | 16.1 | (4.2) |
Employer contributions |  | 13.9 |
Benefits paid | (3.9) | (3.8) |
Fair value of plan assets at end of year | 107.1 | 94.9 | 89.0
Funded status |  |  |
Funded status of the plans | (9.1) | (1.7) |
Items not yet recognized as component of net periodic pension expense |  |  |
Unrecognized net actuarial losses | 27.2 | 23.2 |
Unamortized prior service cost | 4.7 | 2.8 |
Accumulated other comprehensive loss | 31.9 | 26.0 |
Amounts recognized in the statement of financial position |  |  |
Noncurrent liabilities | (9.1) | (1.7) |
Accumulated other comprehensive loss | 31.9 | 26.0 |
Net amount recognized | 22.8 | 24.3 |
Accumulated benefit obligation | 116.2 | 96.6 |
Information for defined benefit plans with an accumulated benefit obligation and projected benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | 116.2 | 53.0 |
Projected benefit obligation | 116.2 | 53.0 |
Fair value of plan assets | 107.1 | 50.1 |
Components of net periodic benefit cost |  |  |
Service cost | 1.6 | 1.7 | 1.5
Interest cost | 3.8 | 3.5 | 3.7
Expected return on plan assets | (5.6) | (5.1) | (4.4)
Settlement loss |  |  | 0.1
Prior service (credit) cost | 0.4 | 0.3 | 0.3
Amortization of net loss | 1.3 | 1.4 | 1.5
Net periodic benefit cost | $ 1.5 | $ 1.8 | $ 2.7
Weighted average assumptions to determine net cost |  |  |
Discount rate (as a percent) | 4.06% | 3.47% | 3.93%
Expected long-term rate of return on plan assets (as a percent) | 6.09% | 5.66% | 6.17%
Weighted average assumptions to determine benefit obligations |  |  |
Discount rate (as a percent) | 2.59% | 4.06% |
Expected long-term rate of return on plan assets (as a percent) | 6.09% | 5.66% |
Expected employer contributions during 2020 | $ 1.8 |  |
Warehouse, delivery, selling, general and administrative expense | SERPs |  |  |
Components of net periodic benefit cost |  |  |
Net periodic benefit cost | 0.9 | $ 0.9 | $ 0.8
Warehouse, delivery, selling, general and administrative expense | Defined Benefit Plans |  |  |
Components of net periodic benefit cost |  |  |
Net periodic benefit cost | 1.6 | 1.7 | 1.5
Other (income) expense, net | SERPs |  |  |
Components of net periodic benefit cost |  |  |
Net periodic benefit cost | 2.4 | 2.0 | 5.7
Other (income) expense, net | Defined Benefit Plans |  |  |
Components of net periodic benefit cost |  |  |
Net periodic benefit cost | $ (0.1) | $ 0.1 | $ 1.2

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