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Accumulated Other Comprehensive Income (Loss) - Amounts in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax $ (115.0) $ 47.1 $ 208.5
Amounts Arising During the Current Period, Income Tax (18.4) 3.8 (43.0)
Amounts Reclassified to Net Income (Loss), Pretax (21.6) (9.4) 48.4
Amounts Reclassified to Net Income (Loss), income Tax 6.4 0.7 (12.9)
Other comprehensive income (loss) (148.6) 42.2 201.0
Cost of revenues 3,743.1 3,707.1 3,461.9
Selling, general and administrative expenses 834.5 688.1 687.0
Interest and other income (expense) 48.7 14.4 3.7
Other operating income (expense) (18.7) 54.2 25.3
Interest expense 235.4 203.8 138.8
Benefit plan adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax 50.5 (17.4) 197.3
Amounts Arising During the Current Period, Income Tax (10.8) 4.3 (45.4)
Amounts Reclassified to Net Income (Loss), Pretax 5.6 2.2 41.5
Amounts Reclassified to Net Income (Loss), income Tax (3.5) (0.6) (10.1)
Other comprehensive income (loss) 41.8 (11.5) 183.3
Foreign currency translation adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (178.8) 65.6 (6.5)
Amounts Arising During the Current Period, Income Tax (6.2) 4.0 2.7
Amounts Reclassified to Net Income (Loss), Pretax (4.6) (5.2) (5.8)
Amounts Reclassified to Net Income (Loss), income Tax 1.1 1.2 1.4
Other comprehensive income (loss) (188.5) 65.6 (8.2)
Gains (losses) on available-for-sale securities      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (2.1) (0.8) (1.2)
Amounts Arising During the Current Period, Income Tax 0.8 (3.7) 0.5
Amounts Reclassified to Net Income (Loss), Pretax (4.6) 5.0 0.3
Amounts Reclassified to Net Income (Loss), income Tax 4.4 (1.7) (0.1)
Other comprehensive income (loss) (1.5) (1.2) (0.5)
Gains (losses) on cash flow hedges      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax 15.6 1.9 25.2
Amounts Arising During the Current Period, Income Tax (2.2) (0.8) (0.8)
Amounts Reclassified to Net Income (Loss), Pretax (17.7) (11.3) 12.4
Amounts Reclassified to Net Income (Loss), income Tax 4.4 1.8 (4.1)
Other comprehensive income (loss) 0.1 (8.4) 32.7
Gains (losses) on cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income      
Other Comprehensive Income Loss [Line Items]      
Other operating income (expense) 0.0 7.8 (8.9)
Interest expense (17.7) (19.1) 3.5
AOCI Attributable to Parent      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (114.8) 49.3 214.8
Amounts Arising During the Current Period, Income Tax (18.4) 3.8 (43.0)
Amounts Reclassified to Net Income (Loss), Pretax (21.3) (9.3) 48.4
Amounts Reclassified to Net Income (Loss), income Tax 6.4 0.7 (12.9)
Other comprehensive income (loss) (148.1) 44.5 207.3
Benefit plan adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax 0.1 0.0 0.4
Amounts Arising During the Current Period, Income Tax 0.0 0.0 0.0
Amounts Reclassified to Net Income (Loss), Pretax (0.3) (0.1) 0.0
Amounts Reclassified to Net Income (Loss), income Tax 0.0 0.0 0.0
Other comprehensive income (loss) (0.2) (0.1) 0.4
Foreign currency translation adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (0.3) (2.2) (6.7)
Amounts Arising During the Current Period, Income Tax 0.0 0.0 0.0
Amounts Reclassified to Net Income (Loss), Pretax 0.0 0.0 0.0
Amounts Reclassified to Net Income (Loss), income Tax 0.0 0.0 0.0
Other comprehensive income (loss) (0.3) (2.2) (6.7)
AOCI Attributable to Noncontrolling Interest      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (0.2) (2.2) (6.3)
Amounts Arising During the Current Period, Income Tax 0.0 0.0 0.0
Amounts Reclassified to Net Income (Loss), Pretax (0.3) (0.1) 0.0
Amounts Reclassified to Net Income (Loss), income Tax 0.0 0.0 0.0
Other comprehensive income (loss) (0.5) (2.3) (6.3)
Benefit plan adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax 50.6 (17.4) 197.7
Amounts Arising During the Current Period, Income Tax (10.8) 4.3 (45.4)
Amounts Reclassified to Net Income (Loss), Pretax 5.3 2.1 41.5
Amounts Reclassified to Net Income (Loss), income Tax (3.5) (0.6) (10.1)
Other comprehensive income (loss) 41.6 (11.6) 183.7
Benefit plan adjustments | Reclassification out of Accumulated Other Comprehensive Income      
Other Comprehensive Income Loss [Line Items]      
Cost of revenues 6.8 5.9 6.3
Selling, general and administrative expenses 2.1 2.0 1.9
Interest and other income (expense) 0.1 0.5 16.7
Foreign currency translation adjustments      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (179.1) 63.4 (13.2)
Amounts Arising During the Current Period, Income Tax (6.2) 4.0 2.7
Amounts Reclassified to Net Income (Loss), Pretax (4.6) (5.2) (5.8)
Amounts Reclassified to Net Income (Loss), income Tax 1.1 1.2 1.4
Other comprehensive income (loss) (188.8) 63.4 (14.9)
Gains (losses) on available-for-sale securities      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax (2.1) (0.8) (1.2)
Amounts Arising During the Current Period, Income Tax 0.8 (3.7) 0.5
Amounts Reclassified to Net Income (Loss), Pretax (4.6) 5.0 0.3
Amounts Reclassified to Net Income (Loss), income Tax 4.4 (1.7) (0.1)
Other comprehensive income (loss) (1.5) (1.2) (0.5)
Gains (losses) on cash flow hedges      
Other Comprehensive Income Loss [Line Items]      
Amounts Arising During the Current Period, Pretax 15.6 1.9 25.2
Amounts Arising During the Current Period, Income Tax (2.2) (0.8) (0.8)
Amounts Reclassified to Net Income (Loss), Pretax (17.7) (11.3) 12.4
Amounts Reclassified to Net Income (Loss), income Tax 4.4 1.8 (4.1)
Other comprehensive income (loss) $ 0.1 $ (8.4) $ 32.7