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Retirement Plans | 9 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Retirement Plans | Retirement Plans The components of net periodic benefit cost for our pension plans are presented below.
| Three months ended |  | Nine months ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 1.4 |  |  | $ | 1.5 |
Pension costs other than service: |  |  |  |  |  |  |
Interest cost | 3.5 |  |  | 3.6 |  |  | 10.7 |  |  | 10.8 |
Expected return on plan assets | (4.1 | ) |  | (4.2 | ) |  | (12.4 | ) |  | (12.7 | )
Amortization of actuarial net loss | 0.8 |  |  | 1.0 |  |  | 2.4 |  |  | 3.0 |
| 0.2 |  |  | 0.4 |  |  | 0.7 |  |  | 1.1 |
Net periodic benefit cost | $ | 0.7 |  |  | $ | 0.9 |  |  | $ | 2.1 |  |  | $ | 2.6 |
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive loss.

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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