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Accumulated Other Comprehensive Income/Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net year-to-date other comprehensive income/(loss), taxes $ (0.2) $ (0.1)
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 16,890.0 14,788.0
Other comprehensive income/(loss) before reclassifications 3.0 5.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 (1.0)
Total other comprehensive income/(loss) [1] 3.0 4.0
Ending balance 16,039.0 15,665.0
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [2] (723.0) (614.0)
Total other comprehensive income/(loss) [2] 3.0 4.0
Ending balance [2] (720.0) (610.0)
Defined benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (498.0) (484.0)
Other comprehensive income/(loss) before reclassifications 3.0 2.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 (1.0)
Total other comprehensive income/(loss) 3.0 1.0
Ending balance (495.0) (483.0)
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (241.0) (146.0)
Other comprehensive income/(loss) before reclassifications 0.0 3.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) 0.0 3.0
Ending balance (241.0) (143.0)
Unrealized gain on derivative instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 16.0 16.0
Other comprehensive income/(loss) before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive income/(loss) 0.0 0.0
Total other comprehensive income/(loss) 0.0 0.0
Ending balance $ 16.0 $ 16.0
[1] Net of deferred taxes of $(0.2) million and ($0.1) million during the three months ended March 31, 2025 and 2024, respectively.
[2] AOCI = accumulated other comprehensive income/loss (Note 8)