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Defined Benefit Plan
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Defined Benefit Plan Defined Benefit Plan
The Company recognizes net periodic benefit cost based on the actuarial analysis performed at the previous year end, adjusted if certain significant events occur during the year.
The components of net periodic benefit cost follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
0.8

 
$
0.6

 
$
1.6

 
$
1.3

Interest cost
 
1.4

 
1.3

 
2.8

 
2.6

Expected return on plan assets
 
(2.6
)
 
(2.6
)
 
(5.2
)
 
(5.1
)
Amortization of unrecognized loss (1)
 
1.2

 
0.7

 
2.3

 
1.3

Net periodic benefit cost
 
$
0.8

 
$
—

 
$
1.5

 
$
0.1


(1) 
Includes amortization of unrecognized actuarial (gain) loss and prior service credits and excludes provision for income tax of $(0.3) million for the six months ended June 30, 2018, and $(0.3) million and $(0.5) million for the three and six months ended June 30, 2017, respectively.
The components of net periodic benefit cost, other than the service cost component, are included in other non-operating (income) expense, net in the Condensed Consolidated Statements of Income.