Retirement and Deferred Compensation Plans - Schedule of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan [Member]
Net Periodic Benefit Cost
Service cost	$ 22.0	$ 21.0	$ 15.1
Interest cost	6.1	9.4	12.7
Expected return on assets	(12.2)	(13.5)	(12.9)
Settlements	1.0	(13.8)	(0.4)
Net loss	4.6	2.7	1.2
Prior service cost	0.7	0.7	0.7
Net periodic benefit cost	22.2	34.1	17.2
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss
Net (gain) loss	(60.0)	44.1	45.5
Prior service cost	0.0	0.4	1.0
Amortization of net loss	(5.6)	6.3	1.6
Amortization of prior service cost	(0.7)	(0.7)	(0.7)
Total recognized in other comprehensive income/loss	(66.3)	37.5	44.2
Total recognized in net periodic benefit cost and other comprehensive income/loss	(44.1)	71.6	61.4
Postretirement Health Coverage [Member]
Net Periodic Benefit Cost
Interest cost	0.2	0.4	0.5
Net loss	(0.2)	(0.1)	0.0
Prior service cost	(0.8)	(0.8)	(0.8)
Net periodic benefit cost	(0.4)	(0.3)	(0.3)
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss
Net (gain) loss	0.2	1.1	0.8
Amortization of net loss	(0.2)	(0.1)	0.0
Amortization of prior service cost	0.8	(0.8)	(0.8)
Total recognized in other comprehensive income/loss	0.8	1.8	1.6
Total recognized in net periodic benefit cost and other comprehensive income/loss	$ 0.4	$ 1.5	$ 1.3