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Retirement Plans and Post Retirement Benefits Level 3 Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | $ 265.9 |  | $ 239.9 |  |
Fair value of plan assets, end of year balance |  | 265.9 |  | 239.9 | $ 274.8 |
Multi-strategy Funds |  |  |  |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [1] | 82.5 |  |  |  |
Fair value of plan assets, end of year balance |  | 82.5 | [1] |  | 35.0 |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 12.9 |  |  |  |
Fair value of plan assets, end of year balance |  | 12.9 |  |  | 12.7 |
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds |  |  |  |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [1] | 12.9 |  |  |  |
Fair value of plan assets, end of year balance |  | 12.9 | [1] |  | 0.0 |
Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds |  |  |  |  |  |
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 12.9 |  | 12.2 |  |
Total unrealized gains (losses) |  | (0.2) |  | 0.7 |  |
Defined Benefit Plan, Redemptions |  | 0.2 |  | (0.1) |  |
Defined Benefit Plan, Mangement Fees |  | (0.2) |  | (0.1) |  |
Fair value of plan assets, end of year balance |  | $ 12.9 |  | $ 12.2 | $ 12.7 | [2]
[1] | The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2] | Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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 (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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