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Other Comprehensive Income (Loss) - Tax Effect (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ (21.4) $ (19.8) $ (86.2) $ 16.2
Foreign currency translation gains/losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items (16.2) (6.4) (68.2) 40.1
Net unrealized gains/losses on available-for-sale securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items 0.6 1.6 2.0 (1.0)
Defined Benefit Pension and Retiree Health Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items (5.3) (3.0) (0.5) (7.0)
Net unrealized gains/losses on cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ (0.5) $ (12.0) $ (19.5) $ (15.9)