Defined Benefit Plans (Details) - Pension Plan - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,269,900,000	$ 1,196,800,000	$ 1,500,000,000
Projected benefit obligation	1,280,500,000	1,302,700,000	1,407,500,000
Net asset (liability)	(10,600,000)	(105,900,000)	92,500,000
Net periodic pension cost	10,900,000	14,800,000	8,600,000
Service cost	57,400,000	33,400,000	20,900,000
Curtailment gain	7,500,000	$ 0	$ 1,400,000
Contributions by employer	54,700,000
Contributions expected in next fiscal year	41,800,000
Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,184,100,000
Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 85,800,000