v3.24.1.1.u2
IMMATERIAL FINANCIAL RESTATEMENT AND RECLASSIFICATIONS TO PRIOR PERIOD FINANCIAL STATEMENTS - Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss) $ (101.0) $ (14.0) $ 30.8 $ 12.5 $ 43.3 $ 29.3 $ (25.2) $ 186.2
Foreign currency translation adjustments (27.7) (55.6) 29.9 19.1 49.0 (6.6) 59.3 (126.1)
Net benefit plan adjustments 0.0   2.1 0.0 2.1 2.1 1.2 (0.6)
Unrealized gain on derivative instruments 2.1 1.6   0.0   1.6 (1.9)  
Other comprehensive income (loss) before tax (25.6) (54.0) 32.0 19.1 51.1 (2.9) 58.6 (126.7)
Provision (benefit) for income tax related to items of comprehensive income (0.5) (0.4) 0.0 0.0 0.0 (0.4) 0.7 0.0
Other comprehensive income (loss), net of tax (26.1) (54.4) 32.0 19.1 51.1 (3.3) 59.3 (126.7)
Comprehensive income (loss) $ (127.1) (68.4) 62.8 31.6 94.4 26.0 34.1 59.5
As Previously Reported                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss)   (13.1) 28.3 17.4 45.7 32.6 (3.4) 192.9
Foreign currency translation adjustments   (56.0) 29.5 18.9 48.4 (7.6) 57.6 (127.0)
Net benefit plan adjustments     2.1   2.1 2.1 1.2 (0.6)
Unrealized gain on derivative instruments   1.6       1.6 (1.9)  
Other comprehensive income (loss) before tax   (54.4) 31.6 18.9 50.5 (3.9) 56.9 (127.6)
Provision (benefit) for income tax related to items of comprehensive income   (0.4) 0.0 0.0 0.0 (0.4) 0.7 0.0
Other comprehensive income (loss), net of tax   (54.8) 31.6 18.9 50.5 (4.3) 57.6 (127.6)
Comprehensive income (loss)   (67.9) 59.9 36.3 96.2 28.3 54.2 65.3
Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss)   (0.9) 2.5 (4.9) (2.4) (3.3) (21.8) (6.7)
Foreign currency translation adjustments   0.4 0.4 0.2 0.6 1.0 1.7 0.9
Net benefit plan adjustments     0.0   0.0 0.0 0.0 0.0
Unrealized gain on derivative instruments   0.0       0.0 0.0  
Other comprehensive income (loss) before tax   0.4 0.4 0.2 0.6 1.0 1.7 0.9
Provision (benefit) for income tax related to items of comprehensive income   0.0 0.0 0.0 0.0 0.0 0.0 0.0
Other comprehensive income (loss), net of tax   0.4 0.4 0.2 0.6 1.0 1.7 0.9
Comprehensive income (loss)   $ (0.5) $ 2.9 $ (4.7) $ (1.8) $ (2.3) $ (20.1) $ (5.8)