Employee Benefits - Activity of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior year end	$ 767.4	$ 1,190.7
Fair value of plan assets at year end	487.9	767.4
Fair Value, Measurements, Recurring
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior year end	767.4
Fair value of plan assets at year end	487.9	767.4
Fair Value, Measurements, Recurring | Private Equities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior year end	18.6
Fair value of plan assets at year end	19.1	18.6
Fair Value, Measurements, Recurring | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Purchases		1.8
Sales	(2.3)	(25.7)
Unrealized gain (loss)	3.0	5.2
Fair value of plan assets at prior year end	26.6	45.3
Fair value of plan assets at year end	27.3	26.6
Fair Value, Measurements, Recurring | Level 3 | Private Equities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets beginning of year	18.6	36.9
Purchases		1.0
Sales	(0.8)	(24.4)
Unrealized gain (loss)	1.3	5.1
Fair value of plan assets at year end	19.1	18.6
Fair value of plan assets at prior year end	18.6
Fair value of plan assets at year end	19.1	18.6
Fair Value, Measurements, Recurring | Level 3 | Fixed Income
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets beginning of year	8.0	8.4
Purchases		0.8
Sales	(1.5)	(1.3)
Unrealized gain (loss)	1.7	0.1
Fair value of plan assets at year end	$ 8.2	$ 8.0