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Accumulated Other Comprehensive Income/Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net year-to-date other comprehensive income/(loss), taxes $ 0.1 $ 0.8 $ (1.8) $ 0.7
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 16,258.0 16,489.0 16,890.0 14,788.0
Other comprehensive income/(loss) before reclassifications 22.0 (86.0) 53.0 (77.0)
Amounts reclassified from accumulated other comprehensive income/(loss) (2.0) 0.0 (2.0) (1.0)
Total other comprehensive income/(loss) 20.0 [1] (86.0) [1] 51.0 [2] (78.0) [2]
Ending balance 17,304.0 16,584.0 17,304.0 16,584.0
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance [3] (692.0) (606.0) (723.0) (614.0)
Total other comprehensive income/(loss) [3] 20.0 (86.0) 51.0 (78.0)
Ending balance [3] (672.0) (692.0) (672.0) (692.0)
Defined benefit plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (497.0) (483.0) (498.0) (484.0)
Other comprehensive income/(loss) before reclassifications 1.0 0.0 2.0 2.0
Amounts reclassified from accumulated other comprehensive income/(loss) (2.0) 0.0 (2.0) (1.0)
Total other comprehensive income/(loss) (1.0) 0.0 0.0 1.0
Ending balance (498.0) (483.0) (498.0) (483.0)
Foreign currency translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (211.0) (139.0) (241.0) (146.0)
Other comprehensive income/(loss) before reclassifications 21.0 (86.0) 51.0 (79.0)
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0 0.0 0.0
Total other comprehensive income/(loss) 21.0 (86.0) 51.0 (79.0)
Ending balance (190.0) (225.0) (190.0) (225.0)
Unrealized gain on derivative instruments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 16.0 16.0 16.0 16.0
Other comprehensive income/(loss) before reclassifications 0.0 0.0 0.0 0.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0 0.0 0.0
Total other comprehensive income/(loss) 0.0 0.0 0.0 0.0
Ending balance $ 16.0 $ 16.0 $ 16.0 $ 16.0
[1] Net of deferred taxes of $0.1 million and $0.8 million during the three months ended September 30, 2025 and 2024, respectively.
[2] Net of deferred taxes of ($1.8) million and $0.7 million during the nine months ended September 30, 2025 and 2024, respectively.
[3] AOCI = accumulated other comprehensive income/loss (Note 9)