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Other Comprehensive Income (Loss) (Schedule of Component of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 5,825.2      
Other comprehensive income (loss) before reclassifications 1,795.4 $ (256.2) $ (997.6)  
Net amount reclassified from accumulated other comprehensive loss 357.9 283.4 214.2  
Net other comprehensive income (loss) 2,153.3 27.2 (783.4)  
Ending balance 9,154.8 5,825.2    
Accumulated other comprehensive income (loss) (4,343.1) (6,496.4)    
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (6,496.4) (6,523.6) (5,740.2)  
Ending balance (4,343.1) (6,496.4) (6,523.6)  
AOCI Attributable to Controlling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (6,496.4) (6,523.6) (5,729.2)  
Ending balance (4,343.1) (6,496.4) (6,523.6)  
AOCI Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated other comprehensive income (loss)       $ 11.0
Continuing Operations        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Net other comprehensive income (loss) 2,153.3 27.2 (840.2)  
Continuing Operations | Foreign Currency Translation Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (1,427.5) (1,678.0) (1,569.7)  
Other comprehensive income (loss) before reclassifications (122.7) 250.5 (46.2)  
Net amount reclassified from accumulated other comprehensive loss 0.0 0.0 (62.1)  
Net other comprehensive income (loss) (122.7) 250.5 (108.3)  
Ending balance (1,550.2) (1,427.5) (1,678.0)  
Continuing Operations | Unrealized Net Gains (Losses) on Securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 14.8 4.9 (22.1)  
Other comprehensive income (loss) before reclassifications (11.9) 6.8 28.9  
Net amount reclassified from accumulated other comprehensive loss 0.8 3.1 (1.9)  
Net other comprehensive income (loss) (11.1) 9.9 27.0  
Ending balance 3.7 14.8 4.9  
Continuing Operations | Defined Benefit Pension and Retiree Health Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (4,751.0) (4,638.6) (3,852.7)  
Other comprehensive income (loss) before reclassifications 1,823.4 (379.7) (967.6)  
Net amount reclassified from accumulated other comprehensive loss 344.0 267.3 181.7  
Net other comprehensive income (loss) 2,167.4 (112.4) (785.9)  
Ending balance (2,583.6) (4,751.0) (4,638.6)  
Continuing Operations | Effective Portion of Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (332.7) (211.9) (238.9)  
Other comprehensive income (loss) before reclassifications 106.6 (133.8) 14.5  
Net amount reclassified from accumulated other comprehensive loss 13.1 13.0 12.5  
Net other comprehensive income (loss) 119.7 (120.8) 27.0  
Ending balance (213.0) (332.7) (211.9)  
Discontinued Operations        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Net other comprehensive income (loss) 0.0 0.0 56.8  
Discontinued Operations | Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 0.0 0.0 (56.8)  
Other comprehensive income (loss) before reclassifications 0.0 0.0 (27.2)  
Net amount reclassified from accumulated other comprehensive loss 0.0 0.0 84.0  
Net other comprehensive income (loss) 0.0 0.0 56.8  
Ending balance $ 0.0 $ 0.0 $ 0.0