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Components of Net Periodic Benefit Cost | 9 Months Ended
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Mar. 31, 2020
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost Net periodic benefit cost for benefit plans include the following components:
|  | Three Months Ended March 31, |  |  |  | Nine Months Ended March 31, |  |
($ in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost |  | $ | 6.2 |  |  | $ | 3.9 |  |  | $ | 18.6 |  |  | $ | 11.7 |
Interest cost |  | 12.3 |  |  | 6.7 |  |  | 36.9 |  |  | 20.1 |
Expected return on plan assets |  | (18.0) |  |  | (8.3) |  |  | (54.0) |  |  | (24.9) |
Amortization of net loss |  | 1.5 |  |  | 1.0 |  |  | 4.5 |  |  | 3.0 |
Amortization of prior service credit |  | (0.4) |  |  | (0.5) |  |  | (1.2) |  |  | (1.5) |
Curtailment credit |  | — |  |  | — |  |  | — |  |  | (0.3) |
Net periodic benefit cost |  | $ | 1.6 |  |  | $ | 2.8 |  |  | $ | 4.8 |  |  | $ | 8.1 |
Service cost is included in operating income. All other components of net periodic benefit cost other than service cost are recorded within other non-operating income (loss), 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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