Employee Benefits - Schedule of Costs of Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net periodic benefit cost:
Interest cost	$ 30.7	$ 37.1
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income):
Amortization of prior net losses	(12.1)	(12.7)	$ (12.9)
Other Postretirement Benefits Plan
Net periodic benefit cost:
Interest cost	30.7	37.1	45.7
Expected return on plan assets	(48.0)	(61.1)	(57.3)
Amortization of prior net losses	12.1	14.3	12.8
Amortization of prior net service credit	(0.4)	(0.4)	(0.4)
Settlement - Annuitization(s)	54.9
Settlements - All Others	9.8	3.6	1.8
Net periodic pension cost (benefit)	59.1	(6.5)	2.6
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income):
Net actuarial (gains) losses and other adjustments	112.7	(216.7)	51.9
Settlement - Annuitization(s)	(54.9)
Settlements - All Others	(9.8)	(3.6)	(1.8)
Amortization of prior net losses	(12.1)	(14.3)	(12.8)
Amortization of prior net service credit	0.4	0.4	0.4
Total recognized in other comprehensive loss (income)	36.3	(234.2)	37.7
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ 95.4	$ (240.7)	$ 40.3