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Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance at December 31:     $ (670.8)     $ (766.2) $ (670.8) $ (766.2)
Other comprehensive income (loss) $ 143.7 $ (32.2) (76.8) $ (79.0) $ (44.5) 67.4 34.7 (56.1)
Balance at June 30: (636.4)     (822.0)     (636.4) (822.0)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 145.5     (86.1)     33.8 (62.2)
Accumulated Translation Adjustment [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance at December 31:     (474.9)     (547.6) (474.9) (547.6)
Other comprehensive income (loss)             33.5 (61.9)
Balance at June 30: (441.4)     (609.5)     (441.4) (609.5)
Accumulated  other comprehensive income (loss)                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss) 142.0 (32.1) (75.5) (78.6) (44.1) 66.9 34.4 (55.8)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance at December 31:     3.0     (4.5) 3.0 (4.5)
Other comprehensive income (loss)             2.8 0.5
Balance at June 30: 5.8     (4.0)     5.8 (4.0)
Accumulated Defined Benefit Plans Adjustment [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance at December 31:     (198.9)     (214.1) (198.9) (214.1)
Other comprehensive income (loss)             (1.9) 5.6
Balance at June 30: (200.8)     (208.5)     (200.8) (208.5)
Noncontrolling Interests                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss) $ 1.7 $ (0.1) $ (1.3) $ (0.4) $ (0.4) $ 0.5    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax             $ 0.3 $ (0.3)