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Components of Net Periodic Pension Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Successor |  |  |  |
Components of net periodic pension costs |  |  |  |
Net periodic postretirement benefit cost |  | $ (21.9) | $ (18.1) |
Successor | Pension Plans, Defined Benefit |  |  |  |
Components of net periodic pension costs |  |  |  |
Service cost for benefits earned |  | 1.6 | 2.3 |
Interest cost on projected benefit obligation |  | 28.0 | 31.4 |
Expected return on plan assets |  | (33.5) | (42.8) |
Amortization of prior service cost |  | 0.0 | 0.0 |
Amortization of actuarial losses |  | 0.0 | 0.0 |
Settlement charge |  | 2.1 | 0.0 |
Net actuarial gain |  | (23.5) | 4.2 |
Net periodic postretirement benefit cost |  | $ (25.3) | $ (4.9) |
Predecessor |  |  |  |
Components of net periodic pension costs |  |  |  |
Net periodic postretirement benefit cost | $ (14.4) |  |  | $ (57.1)
Predecessor | Pension Plans, Defined Benefit |  |  |  |
Components of net periodic pension costs |  |  |  |
Service cost for benefits earned | 0.6 |  |  | 2.5
Interest cost on projected benefit obligation | 9.7 |  |  | 41.5
Expected return on plan assets | (11.0) |  |  | (45.3)
Amortization of prior service cost | 0.1 |  |  | 0.3
Amortization of actuarial losses | 6.3 |  |  | 24.7
Settlement charge | 0.0 |  |  | 0.0
Net actuarial gain | 0.0 |  |  | 0.0
Net periodic postretirement benefit cost | $ 5.7 |  |  | $ 23.7

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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