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Employee Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2020

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,
		2020				2019				2020				2019
Components of net periodic benefit cost
Service cost		$	2.5			$	2.4			$	7.6			$	7.2
Interest cost			4.2				4.6				12.8				14.0
Expected return on plan assets			(5.1	)			(4.9	)			(15.4	)			(14.9	)
Amortization of prior service cost (benefit)			0.4				0.4				1.2				1.3
Curtailment			—				—				—				1.2
Amortization of net actuarial loss (gain)			0.9				—				2.5				0.1
Expenses paid			1.0				0.6				3.0				1.8
Net periodic benefit cost		$	3.9			$	3.1			$	11.7			$	10.7

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

		Three Months Ended June 30,								Nine Months Ended June 30,
		2020				2019				2020				2019
Components of net periodic benefit cost
Service cost		$	0.9			$	0.8			$	2.6			$	2.3
Interest cost			0.4				0.5				1.2				1.5
Amortization of prior service cost (benefit)			(0.2	)			(0.4	)			(0.7	)			(1.1	)
Amortization of net actuarial loss (gain)			—				(0.1	)			(0.1	)			(0.2	)
Net periodic benefit cost		$	1.1			$	0.8			$	3.0			$	2.5