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Retirement Plans | 6 Months Ended
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Mar. 31, 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 |  | Six months ended
| March 31, |  | March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
Service cost | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 0.9 |  |  | $ | 1.0 |
Pension costs other than service: |  |  |  |  |  |  |
Interest cost | 3.6 |  |  | 3.6 |  |  | 7.2 |  |  | 7.2 |
Expected return on plan assets | (4.1 | ) |  | (4.2 | ) |  | (8.3 | ) |  | (8.5 | )
Amortization of actuarial net loss | 0.8 |  |  | 1.0 |  |  | 1.6 |  |  | 2.0 |
| 0.3 |  |  | 0.4 |  |  | 0.5 |  |  | 0.7 |
Net periodic benefit cost | $ | 0.7 |  |  | $ | 0.9 |  |  | $ | 1.4 |  |  | $ | 1.7 |
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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