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Defined Benefit Plan (Tables)
6 Months Ended
Jun. 30, 2019
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)
2019201820192018
Service cost$0.7 $0.8 $1.4 $1.6 
Interest cost1.5 1.4 3.0 2.8 
Expected return on plan assets(2.4)(2.6)(4.8)(5.2)
Amortization of unrecognized loss1
0.8 1.2 1.7 2.3 
Net periodic benefit cost$0.6 $0.8 $1.3 $1.5 
1.Includes amortization of unrecognized actuarial (gain) loss and prior service credits and excludes provision for income tax of $(0.2) million and $(0.4) million for the three and six months ended June 30, 2019, respectively, and $(0.3) million for the six months ended June 30, 2018.