Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures [Table Text Block]

For the three month periods ended March 31, 2019 and 2018, 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,
	2019			2018			2019			2018
Service cost - benefits earned during the year	$	3.2		$	4.2		$	0.5		$	0.6
Interest cost on benefits earned in prior years	26.3			26.1			3.7			3.1
Expected return on plan assets	(32.8		)	(39.5		)	—			—
Amortization of prior service cost (credit)	0.1			0.1			(0.7		)	(0.7		)
Amortization of net actuarial loss	18.4			16.5			3.3			2.7
Total retirement benefit expense	$	15.2		$	7.4		$	6.8		$	5.7