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Retirement Plans | 6 Months Ended
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Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Retirement Plans | Retirement Plans The components of net periodic benefit cost are as follows.
| Three months ended |  | Six months ended
| March 31, |  | March 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in millions)
Service cost | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 1.0 |  |  | $ | 0.8 |
Interest cost | 5.0 |  |  | 5.0 |  |  | 10.0 |  |  | 10.0 |
Expected return on plan assets | (6.1 | ) |  | (6.0 | ) |  | (12.3 | ) |  | (11.9 | )
Amortization of actuarial net loss | 0.8 |  |  | 0.9 |  |  | 1.6 |  |  | 1.8 |
Net periodic benefit cost | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.7 |
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss). We contributed $1 million to our Canadian pension plans during the six months ended March 31, 2015. For financial reporting purposes, our pension plan obligations were 89% funded at September 30, 2014.

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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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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