Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures [Table Text Block]

For the three month periods ended March 31, 2020 and 2019, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 

	Pension Benefits						Other Postretirement Benefits
	Three months ended March 31,						Three months ended March 31,
	2020			2019			2020			2019
Service cost - benefits earned during the year	$	3.2		$	3.2		$	0.5		$	0.5
Interest cost on benefits earned in prior years	21.5			26.3			2.7			3.7
Expected return on plan assets	(33.6		)	(32.8		)	—			—
Amortization of prior service cost (credit)	0.2			0.1			(0.9		)	(0.7		)
Amortization of net actuarial loss	18.6			18.4			2.7			3.3
Total retirement benefit expense	$	9.9		$	15.2		$	5.0		$	6.8