Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost from Continuing Operations

The components of total Net Periodic Benefit Cost from continuing operations associated with the Company’s defined benefit retirement plans are as follows (dollars in millions):

	Three months ended						Nine months ended
	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
Service cost	$	4.9		$	4.9		$	14.8		$	14.3
Interest cost		4.6			5.0			13.9			14.9
Expected return on plan assets		(5.6	)		(4.8	)		(16.8	)		(14.6	)
Amortization prior service cost		0.1			0.2			0.2			0.3
Amortization of actuarial loss		0.8			2.0			2.5			5.8
Net Periodic Benefit Cost	$	4.8		$	7.3		$	14.6		$	20.7