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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Retirement Plans |
Schedule of breakdown of shares held by ESOP |
(in millions) |  | 2015 |  | 2014 |  | 2013 |
Shares held by the ESOP |  |  | 1.3 |  |  | 1.4 |  |  | 1.7 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined Benefit Plans |
Retirement Plans |
Schedule of reconciliation of the beginning and ending balances of the projected pension benefit obligation, the fair value of the plan assets and the ending accumulated benefit obligation |
(in millions) |  | 2015 |  | 2014 |
Funded status |  |  |  |  |  |  |
Projected benefit obligation |  |  |  |  |  |  |
Beginning of year |  | $ | 192.3 |  | $ | 179.7 |
Change in benefit obligation: |  |  |  |  |  |  |
Service cost |  |  | 3.7 |  |  | 4.0 |
Interest cost |  |  | 7.1 |  |  | 7.7 |
Plan amendments |  |  | — |  |  | 0.6 |
Actuarial (gain)/loss |  |  | (16.7 | ) |  | 19.1 |
Benefits paid |  |  | (12.1 | ) |  | (18.8 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
End of year |  |  | 174.3 |  |  | 192.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets |  |  |  |  |  |  |
Beginning of year |  |  | 177.3 |  |  | 173.5 |
Change in plan assets: |  |  |  |  |  |  |
Actual return on plan assets |  |  | (3.5 | ) |  | 21.6 |
Company contributions |  |  | 1.0 |  |  | 1.0 |
Benefits paid |  |  | (12.1 | ) |  | (18.8 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
End of year |  |  | 162.7 |  |  | 177.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Unfunded) funded status end of year |  | $ | (11.6 | ) | $ | (15.0 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated benefit obligation at end of year |  | $ | 173.5 |  | $ | 191.2 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of fair value of the plans' assets by asset category | Fair Value Measurements at December 31, 2015
Asset Category (in millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Observable Inputs (Level 3) |  | Total |
Cash |  | $ | 0.6 |  | $ | — |  | $ | — |  | $ | 0.6 |
Mutual funds: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity mutual funds(1) |  | $ | 19.8 |  | $ | — |  | $ | — |  | $ | 19.8 |
Fixed income mutual funds(2) |  |  | 142.3 |  |  | — |  |  | — |  |  | 142.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 162.7 |  | $ | — |  | $ | — |  | $ | 162.7 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value Measurements at December 31, 2014
Asset Category (in millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Observable Inputs (Level 3) |  | Total |
Cash |  | $ | 0.6 |  | $ | — |  | $ | — |  | $ | 0.6 |
Mutual funds: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity mutual funds(1) |  | $ | 21.4 |  | $ | — |  | $ | — |  | $ | 21.4 |
Fixed income mutual funds(2) |  |  | 155.3 |  |  | — |  |  | — |  |  | 155.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 177.3 |  | $ | — |  | $ | — |  | $ | 177.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) | This category is comprised of investments in mutual funds that invest in equity securities such as large publicly traded companies listed in the S&P 500 Index; small to medium sized companies with market capitalization in the range of the Russell 2500 Index; and foreign issuers in emerging markets.
(2) | This category is comprised of investments in mutual funds that invest in U.S. corporate and government fixed income securities, including asset-backed securities; high yield fixed income securities primarily rated BB, B, CCC, CC, C and D; and US dollar denominated debt securities of government, government related and corporate issuers in emerging market countries.
Schedule of net asset (liability) |
(in millions) |  | 2015 |  | 2014 |
Noncurrent assets |  | $ | 9.7 |  | $ | 7.7 |
Current liabilities |  |  | (1.0 | ) |  | (1.0 | )
Noncurrent liabilities |  |  | (20.3 | ) |  | (21.7 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Asset (liability) at end of year |  | $ | (11.6 | ) | $ | (15.0 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Components of net periodic benefit cost |
(in millions) |  | 2015 |  | 2014 |  | 2013 |
Service cost |  | $ | 3.7 |  | $ | 4.0 |  | $ | 5.1 |
Interest cost |  |  | 7.1 |  |  | 7.7 |  |  | 8.1 |
Expected return on plan assets |  |  | (10.2 | ) |  | (10.8 | ) |  | (12.2 | )
Settlement cost |  |  | — |  |  | — |  |  | 8.9 |
Amortization of unrecognized net loss |  |  | 4.1 |  |  | 3.3 |  |  | 6.5 |
Amortization of unrecognized prior service credit |  |  | 0.2 |  |  | 0.3 |  |  | 0.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net periodic benefit cost |  | $ | 4.9 |  | $ | 4.5 |  | $ | 16.7 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of weighted-average assumptions for benefit obligations |
|  | 2015 |  | 2014 |
Discount rate |  |  | 4.15 | % |  | 3.84 | %
Rate of compensation increase |  |  | 4.29 | % |  | 4.29 | %
Expected long-term return on plan assets |  |  | 6.20 | % |  | 6.30 | %
Schedule of weighted-average assumptions for net periodic benefit cost |
|  | 2015 |  | 2014 |  | 2013 |
Discount rate |  |  | 3.87 | % |  | 4.58 | % |  | 3.77 | %
Rate of compensation increase |  |  | 4.29 | % |  | 4.29 | % |  | 4.29 | %
Expected long-term return on plan assets |  |  | 6.30 | % |  | 6.48 | % |  | 6.50 | %
Summary of estimated future benefits to be paid for the Company's defined benefit pension plans and post-retirement medical plan | The following is a summary of estimated future benefits to be paid for the Company's defined benefit pension plans at December 31, 2015.
(in millions) |  | Estimated Benefit Payments |
Year |  |  |  |
2016 |  | $ | 14.9 |
2017 |  |  | 15.5 |
2018 |  |  | 15.1 |
2019 |  |  | 14.6 |
2020 |  |  | 14.4 |
2021 - 2025 |  |  | 64.3 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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