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Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net pension plan obligation |  | $ 211.5 |
Expected contributions to TRP in current fiscal year |  | 20.6 |
Contributions to plan | $ 1.7 |  |
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to plan |  | 3.8 | $ 3.3
Accrued Liabilities | Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net pension plan obligation |  | $ 31.0 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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