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Other Comprehensive Income (Loss) (AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     $ 10,775.4  
Other comprehensive income (loss) before reclassifications $ (12.1) $ (79.2) 38.0 $ (145.1)
Net amount reclassified from accumulated other comprehensive loss 15.9 71.1 21.7 192.4
Net other comprehensive income (loss) 3.8 (8.1) 59.7 47.3
Ending balance 11,307.4   11,307.4  
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (3,788.7) (4,287.7) (3,844.6) (4,343.1)
Ending balance (3,784.9) (4,295.8) (3,784.9) (4,295.8)
Foreign Currency Translation Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (1,885.3) (1,844.2) (1,874.2) (1,550.2)
Other comprehensive income (loss) before reclassifications (88.7) (165.1) (74.6) (459.7)
Net amount reclassified from accumulated other comprehensive loss 0.0 0.0 (25.2) 0.6
Net other comprehensive income (loss) (88.7) (165.1) (99.8) (459.1)
Ending balance (1,974.0) (2,009.3) (1,974.0) (2,009.3)
Net Unrealized Gains (Losses) on Available-For-Sale Securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (33.5) (27.9) (37.1) 3.7
Other comprehensive income (loss) before reclassifications (13.5) (24.9) (11.3) (55.5)
Net amount reclassified from accumulated other comprehensive loss 1.4 13.5 2.8 12.5
Net other comprehensive income (loss) (12.1) (11.4) (8.5) (43.0)
Ending balance (45.6) (39.3) (45.6) (39.3)
Defined Benefit Pension and Retiree Health Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (2,058.8) (2,443.2) (2,062.3) (2,583.6)
Other comprehensive income (loss) before reclassifications 10.5 47.8 (11.9) 72.9
Net amount reclassified from accumulated other comprehensive loss 13.0 57.2 38.9 172.5
Net other comprehensive income (loss) 23.5 105.0 27.0 245.4
Ending balance (2,035.3) (2,338.2) (2,035.3) (2,338.2)
Net unrealized gains/losses on cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 188.9 27.6 129.0 (213.0)
Other comprehensive income (loss) before reclassifications 79.6 63.0 135.8 297.2
Net amount reclassified from accumulated other comprehensive loss 1.5 0.4 5.2 6.8
Net other comprehensive income (loss) 81.1 63.4 141.0 304.0
Ending balance $ 270.0 $ 91.0 $ 270.0 $ 91.0