Defined Benefit Plans (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,202.6	$ 1,066.1	$ 1,269.9
Projected benefit obligation	1,214.2	1,016.0	1,280.5
Net asset (liability)	(11.6)	50.1	(10.6)
Net periodic pension cost	25.6	1.8	10.9
Service cost	38.6	39.6	57.4
Curtailment gain	0.0	$ 4.0	$ 7.5
Contributions by employer	49.2
Contributions expected in next fiscal year	49.7
Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	969.5
Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 233.1