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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to common shareholders $ 55.2 $ (59.3) $ 206.5 $ 303.9
Components of other comprehensive income (loss), net of tax        
Currency translation adjustment (15.7) (77.7) (2.3) (175.2)
Changes in pension and postretirement plan assets and benefit obligation, net of tax 3.6 2.3 8.9 9.1
Other comprehensive (loss) income, net of tax (12.1) (75.4) 6.6 (166.1)
Comprehensive income (loss) before allocation to noncontrolling interests 43.1 (134.7) 213.1 137.8
Less: Noncontrolling interests in comprehensive income (loss) 0.0 (0.3) (0.2) (0.3)
Comprehensive income (loss) attributable to common shareholders $ 43.1 $ (134.4) $ 213.3 $ 138.1