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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)

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