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Comprehensive Income Parenthetical (Parentheticals) - 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 |  |  |  |
Net unrealized gains (losses) on cash flow hedges, tax provision |  | $ 0.0 | $ 0.0 |
Postretirement plans and workers' compensation obligations, tax (benefit) provision |  | $ 0.0 | $ 7.1 |
Predecessor |  |  |  |
Net unrealized gains (losses) on cash flow hedges, tax provision | $ 9.1 |  |  | $ 85.9
Postretirement plans and workers' compensation obligations, tax (benefit) provision | $ 2.5 |  |  | $ (1.5)

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