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Defined Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of net periodic benefit cost The components of net periodic benefit cost for the three months ended March 31, follows:
(in millions)
 
2018
 
2017
Service cost
 
$
0.8

 
$
0.7

Interest cost
 
1.4

 
1.3

Expected return on plan assets
 
(2.6
)
 
(2.5
)
Amortization of unrecognized loss (1)
 
1.1

 
0.6

Net periodic benefit cost
 
$
0.7

 
$
0.1


(1) 
Includes amortization of unrecognized actuarial (gain) loss and prior service credits and excludes provision for income tax of $(0.3) million and $(0.2) million for the three months ended March 31, 2018 and 2017, respectively.