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Employee Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee benefit plans |  |  |
Unfunded direct benefits paid | $ 8.1 |  |
Estimated future benefit payments, net of subsidies: |  |  |
2020 | 7.3 |  |
2021 | 6.7 |  |
2022 | 6.1 |  |
2023 | 5.6 |  |
2024 | 5.0 |  |
Subsequent five years | 19.3 |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation — beginning of year | 68.8 | $ 77.6 |
Interest cost | 2.4 | 2.3 | $ 3.5
Actuarial (gains) losses | 2.5 | (2.3) |
Benefits paid | (8.1) | (8.3) |
Plan amendment | (1.8) | (0.1) |
Projected benefit obligation — end of year | 63.6 | 68.8 | 77.6
Funded status at year-end | (63.6) | (68.8) |
Other assets | 0.0 |  |
Accrued expenses | 7.2 | 8.3 |
Other long-term liabilities | 56.4 | 60.5 |
Net amount recognized | (63.6) | (68.8) |
Amount recognized in accumulated other comprehensive income (pre-tax) consists of — net prior service (credits) costs | (24.9) | (27.1) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 0.0 | 0.0 | 0.0
Interest cost | 2.4 | 2.3 | 3.5
Amortization of unrecognized prior service credits | (4.0) | (4.0) | (1.7)
Plan amendment | 0.0 | 0.0 | (2.6)
Recognized net actuarial (gains) losses | 2.5 | (2.3) | (2.8)
Total net periodic pension benefit expense | $ 0.9 | $ (4.0) | $ (3.6)
Assumptions - Actuarial assumptions used in accounting for plans |  |  |
Health care cost trend rate for next year | 6.75% | 7.00% | 7.25%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00% | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate | 2027 | 2027 | 2027
Discount rate used in determining net periodic postretirement benefit expense | 4.09% | 3.34% | 3.60%
Discount rate used in determining year-end postretirement benefit obligation | 2.97% | 4.09% | 3.34%

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- Definition The amount of direct payments made, net of subsidies, for which participants are entitled under a unfunded pension plan, including pension benefits, death benefits, and benefits due on termination of employment. + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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