Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures [Table Text Block]

For the three month periods ended June 30, 2018 and 2017, 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 June 30,						Three months ended June 30,
	2018			2017			2018			2017
Service cost - benefits earned during the year	$	4.0		$	3.5		$	0.6		$	0.6
Interest cost on benefits earned in prior years	26.3			29.2			3.2			3.6
Expected return on plan assets	(39.5		)	(36.7		)	—			—
Amortization of prior service cost (credit)	0.1			0.3			(0.7		)	(0.7		)
Amortization of net actuarial loss	16.5			15.7			2.6			2.3
Curtailment loss	0.4			—			—			—
Total retirement benefit expense	$	7.8		$	12.0		$	5.7		$	5.8

For the six month periods ended June 30, 2018 and 2017, 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
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost - benefits earned during the year	$	8.2		$	7.0		$	1.2		$	1.2
Interest cost on benefits earned in prior years	52.4			58.4			6.3			7.3
Expected return on plan assets	(79.0		)	(73.4		)	—			—
Amortization of prior service cost (credit)	0.2			0.6			(1.4		)	(1.4		)
Amortization of net actuarial loss	33.0			31.3			5.3			4.5
Curtailment loss	0.4			—			—			—
Total retirement benefit expense	$	15.2		$	23.9		$	11.4		$	11.6