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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, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 9,154.8    
Other comprehensive income (loss) before reclassifications 247.7 $ 1,795.4 $ (256.2)
Net amount reclassified from accumulated other comprehensive loss 250.8 357.9 283.4
Other comprehensive income, net of tax (Note 17) 498.5 2,153.3 27.2
Ending balance 10,775.4 9,154.8  
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (4,343.1) (6,496.4) (6,523.6)
Ending balance (3,844.6) (4,343.1) (6,496.4)
Foreign Currency Translation Gains (Losses)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (1,550.2) (1,427.5) (1,678.0)
Other comprehensive income (loss) before reclassifications (324.4) (122.7) 250.5
Net amount reclassified from accumulated other comprehensive loss 0.4 0.0 0.0
Other comprehensive income, net of tax (Note 17) (324.0) (122.7) 250.5
Ending balance (1,874.2) (1,550.2) (1,427.5)
Unrealized Net Gains (Losses) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 3.7 14.8 4.9
Other comprehensive income (loss) before reclassifications (52.2) (11.9) 6.8
Net amount reclassified from accumulated other comprehensive loss 11.4 0.8 3.1
Other comprehensive income, net of tax (Note 17) (40.8) (11.1) 9.9
Ending balance (37.1) 3.7 14.8
Defined Benefit Pension and Retiree Health Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2,583.6) (4,751.0) (4,638.6)
Other comprehensive income (loss) before reclassifications 291.5 1,823.4 (379.7)
Net amount reclassified from accumulated other comprehensive loss 229.8 344.0 267.3
Other comprehensive income, net of tax (Note 17) 521.3 2,167.4 (112.4)
Ending balance (2,062.3) (2,583.6) (4,751.0)
Effective Portion of Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (213.0) (332.7) (211.9)
Other comprehensive income (loss) before reclassifications 332.8 106.6 (133.8)
Net amount reclassified from accumulated other comprehensive loss 9.2 13.1 13.0
Other comprehensive income, net of tax (Note 17) 342.0 119.7 (120.8)
Ending balance $ 129.0 $ (213.0) $ (332.7)