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Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2021

Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Net Periodic Benefit Cost

Components of net periodic pension benefit cost were as follows (in millions):

		Three Months Ended June 30,								Nine Months Ended June 30,
		2021				2020				2021				2020
Components of net periodic benefit cost
Service cost		$	2.8			$	2.5			$	8.6			$	7.6
Interest cost			4.1				4.2				12.3				12.8
Expected return on plan assets			(4.9	)			(5.1	)			(14.8	)			(15.4	)
Amortization of prior service cost (benefit)			0.6				0.4				1.7				1.2
Amortization of net actuarial loss (gain)			1.4				0.9				3.8				2.5
Expenses paid			0.8				1.0				2.3				3.0
Net periodic benefit cost		$	4.8			$	3.9			$	13.9			$	11.7

Components of net periodic other post-employment benefit cost were as follows (in millions):

		Three Months Ended June 30,								Nine Months Ended June 30,
		2021				2020				2021				2020
Components of net periodic benefit cost
Service cost		$	0.6			$	0.9			$	1.7			$	2.6
Interest cost			0.3				0.4				0.9				1.2
Amortization of prior service cost (benefit)			(0.4	)			(0.2	)			(1.1	)			(0.7	)
Amortization of net actuarial loss (gain)			0.1				—				0.2				(0.1	)
Net periodic benefit cost		$	0.6			$	1.1			$	1.7			$	3.0