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Retirement Plans (Tables) | 6 Months Ended
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Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Net Periodic Benefit Cost | 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 |

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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=35743120&loc=d3e1928-114920 + Details
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