Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Expense (Income) [Table Text Block]

	Pension						Other Postretirement
Components of Net Periodic Benefit Cost (Credit)	2019			2018			2019			2018
Millions
Quarter Ended September 30,
Service Cost		$2.3			$2.7			$1.0			$1.2
Non-Service Cost Components (a)
Interest Cost	7.9			7.4			1.9			1.8
Expected Return on Plan Assets	(11.0		)	(11.1		)	(2.6		)	(2.7		)
Amortization of Prior Service Credits	—			—			(0.4		)	(0.4		)
Amortization of Net Loss	1.9			3.0			0.1			0.2
Net Periodic Benefit Cost		$1.1			$2.0		—				$0.1
Nine Months Ended September 30,
Service Cost		$7.0			$8.2			$2.8			$3.7
Non-Service Cost Components (a)
Interest Cost	23.9			22.2			5.7			5.4
Expected Return on Plan Assets	(33.3		)	(33.2		)	(7.9		)	(8.2		)
Amortization of Prior Service Credits	(0.2		)	—			(1.5		)	(1.3		)
Amortization of Net Loss	5.1			9.0			0.2			0.6
Net Periodic Benefit Cost (Credit)		$2.5			$6.2		$(0.7)				$0.2

(a)

These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.