Defined Benefit Plan (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Components of net periodic benefit cost

The components of net periodic benefit cost follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in millions)	2018		2017		2018		2017
Service cost	$	0.8	$	0.7	$	2.4	$	2.0
Interest cost	1.3		1.3		4.1		3.9
Expected return on plan assets	(2.5)		(2.5)		(7.7)		(7.6)
Amortization of unrecognized loss1	1.1		0.6		3.4		1.9
Net periodic benefit cost	$	0.7	$	0.1	$	2.2	$	0.2

^1. Includes amortization of unrecognized actuarial (gain) loss and prior service credits and excludes provision for income tax of $(0.6) million $(0.9) million for the three and nine months ended September 30, 2018, and $(0.3) million and $(0.8) million for the three and nine months ended September 30, 2017, respectively.