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Pension and Other Postretirement Benefits (Tables) | 9 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of components of the net periodic benefit cost | The components of the net periodic benefit cost related to the Company’s pension and other postretirement benefits for the three and nine months ended March 31, 2016 and 2015 were as follows:
Three months ended March 31, |  | Pension Plans |  | Other Postretirement Plans
($ in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 7.8 |  |  | $ | 8.0 |  |  | $ | 0.8 |  |  | $ | 1.1 |
Interest cost |  | 14.4 |  |  | 13.5 |  |  | 2.5 |  |  | 3.0 |
Expected return on plan assets |  | (16.4 | ) |  | (17.2 | ) |  | (1.7 | ) |  | (1.7 | )
Amortization of net loss |  | 6.8 |  |  | 4.2 |  |  | 0.7 |  |  | 0.5 |
Amortization of prior service cost (benefit) |  | 0.1 |  |  | 0.1 |  |  | (1.6 | ) |  | — |
Net periodic benefit costs |  | $ | 12.7 |  |  | $ | 8.6 |  |  | $ | 0.7 |  |  | $ | 2.9 |
Nine months ended March 31, |  | Pension Plans |  | Other Postretirement Plans
($ in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 23.4 |  |  | $ | 24.0 |  |  | $ | 2.5 |  |  | $ | 3.3 |
Interest cost |  | 43.2 |  |  | 40.5 |  |  | 7.7 |  |  | 9.0 |
Expected return on plan assets |  | (49.3 | ) |  | (51.6 | ) |  | (5.2 | ) |  | (5.0 | )
Amortization of net loss |  | 20.5 |  |  | 12.6 |  |  | 2.0 |  |  | 1.5 |
Amortization of prior service cost (benefit) |  | 0.3 |  |  | 0.3 |  |  | (4.8 | ) |  | — |
Net periodic benefit costs |  | $ | 38.1 |  |  | $ | 25.8 |  |  | $ | 2.2 |  |  | $ | 8.8 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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