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Other Comprehensive Income (Loss) (Tax Effect) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items $ (7.9) $ (3.6) $ (134.3) $ 23.5
Foreign Currency Translation Gains (Losses)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items (21.9) 27.4 (53.3) (11.1)
Unrealized net gains/losses on securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items (1.3) (2.4) 3.1 (2.8)
Defined Benefit Pension and Retiree Health Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items (20.2) (18.9) (51.5) (44.6)
Effective portion of cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items $ 35.5 $ (9.7) $ (32.6) $ 82.0