Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation, period increase (decrease)	$ (930.1)	$ 1,090.0
Expense under the plans	$ 249.7	222.6	$ 170.6
Percentage of global investments in plan assets	85.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for our defined benefit pension plans	$ 12,180.0	$ 12,740.0
Expected future employer contributions, next fiscal year	$ 30.0
Marketable equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation	80.00%
Developed markets
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation	20.00%