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Accumulated Other Comprehensive Income (Loss) - AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2017 | Apr. 01, 2017
Predecessor |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | $ 0.0 | $ 181.5
Reclassification from other comprehensive income to earnings |  | 23.0
Current period change |  | 5.5
Fresh start reporting adjustment |  | 448.5
Ending Balance |  | 0.0
Predecessor | Foreign Currency Translation Adjustment |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | 0.0 | (148.2)
Reclassification from other comprehensive income to earnings |  | 0.0
Current period change |  | 5.5
Fresh start reporting adjustment |  | 142.7
Ending Balance |  | 0.0
Predecessor | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | 0.0 | (256.3)
Reclassification from other comprehensive income to earnings |  | 5.8
Current period change |  | 0.0
Fresh start reporting adjustment |  | 250.5
Ending Balance |  | 0.0
Predecessor | Prior Service Cost Associated with Postretirement Plans |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | 0.0 | 21.7
Reclassification from other comprehensive income to earnings |  | (1.4)
Current period change |  | 0.0
Fresh start reporting adjustment |  | (20.3)
Ending Balance |  | 0.0
Predecessor | Cash Flow Hedges |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | 0.0 | (94.2)
Reclassification from other comprehensive income to earnings |  | 18.6
Current period change |  | 0.0
Fresh start reporting adjustment |  | 75.6
Ending Balance |  | 0.0
Predecessor | Total Accumulated Other Comprehensive (Loss) Income |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning Balance | 0.0 | (477.0)
Ending Balance |  | $ 0.0
Successor |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Current period change | 0.5 |
Ending Balance | 3,231.7 |
Successor | Foreign Currency Translation Adjustment |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Current period change | 0.5 |
Ending Balance | 0.5 |
Successor | Net Actuarial Loss Associated with Postretirement Plans and Workers’ Compensation Obligations |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Current period change | 0.0 |
Ending Balance | 0.0 |
Successor | Prior Service Cost Associated with Postretirement Plans |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Current period change | 0.0 |
Ending Balance | 0.0 |
Successor | Cash Flow Hedges |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Current period change | 0.0 |
Ending Balance | 0.0 |
Successor | Total Accumulated Other Comprehensive (Loss) Income |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Ending Balance | $ 0.5 |

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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