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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 07, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Unrealized loss on cash flow hedges arising during the period, tax   $ 0.0 $ (3.4) $ (3.7)
Reclassification adjustment for net losses included in net income, tax   5.8 2.0 0.5
Net gain (loss) arising from remeasurement during the period, tax $ 0.8 1.8 (0.8) 0.7
Amortization of prior service benefits included in net income, tax   (0.4) (0.6) (0.6)
Amortization of net actuarial loss included in net income, tax   $ 3.6 4.4 $ 3.6
Reclassification adjustment for pension settlement charges included in net income, tax     $ 0.9