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Defined Benefit Plan | 9 Months Ended
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Sep. 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) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 0.7 |  | $ | 0.8 |  | $ | 1.4 |  | $ | 1.6
Interest cost |  | 1.5 |  | 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. The components of net periodic benefit cost, other than the service cost component, are included in other non-operating (income) expense, net.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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