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Defined Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost 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.