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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Employee Benefit Plans |
Schedule of funded status of the defined benefit plans and amounts recognized in the consolidated balance sheets |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (in millions) |
Change in projected benefit obligation |  |  |  |  |  |  |
Balance at beginning of the year |  | $ | 158.9 |  | $ | 126.3 |
Service cost |  |  | 1.3 |  |  | 0.7 |
Administration costs paid |  |  | (1.8 | ) |  | (1.5 | )
Interest cost |  |  | 4.0 |  |  | 5.9 |
Actuarial (gain) loss |  |  | (5.0 | ) |  | 32.6 |
Benefits paid |  |  | (3.8 | ) |  | (5.1 | )
Settlement |  |  | (153.6 | ) |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at end of year |  |  | — |  | $ | 158.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in fair value of plan assets |  |  |  |  |  |  |
Balance at beginning of the year |  | $ | 118.9 |  | $ | 103.7 |
Actual (loss) gain on assets |  |  | (3.5 | ) |  | 21.1 |
Employer contributions |  |  | 43.8 |  |  | 0.7 |
Administration costs paid |  |  | (1.8 | ) |  | (1.5 | )
Benefits paid |  |  | (3.8 | ) |  | (5.1 | )
Settlement |  |  | (153.6 | ) |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at end of the year |  |  | — |  | $ | 118.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Funded status at end of year |  |  | — |  | $ | (40.0 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of amounts recognized in accumulated other comprehensive income |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (in millions) |
Net actuarial loss recognized |  | $ | (58.9 | ) | $ | 58.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Information for pension plans with an accumulated benefit obligation in excess of plan assets |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (in millions) |
Projected benefit obligation |  |  | — |  | $ | 158.9 |
Accumulated benefit obligation |  |  | — |  | $ | 158.9 |
Fair value of plan assets |  |  | — |  | $ | 118.9 |
Schedule of the components of net periodic benefit cost |
|  | Years Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in millions) |
Service cost—benefits earned |  | $ | 1.3 |  | $ | 0.7 |  | $ | 0.5 |
Interest costs on benefits obligation |  |  | 4.0 |  |  | 5.9 |  |  | 5.4 |
Expected return on assets |  |  | (3.4 | ) |  | (6.3 | ) |  | (6.8 | )
Net actuarial loss amortization |  |  | 1.1 |  |  | 1.2 |  |  | 1.0 |
Settlement charge |  |  | 59.7 |  |  | 1.2 |  |  | 1.0 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net periodic benefit cost |  | $ | 62.7 |  | $ | 1.5 |  | $ | 0.1 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of weighted average assumptions used to determine benefit obligations |
|  | December 31, |
|  | 2015 |  | 2014 |
Discount rate |  |  | N/A |  |  | 3.5 | %
Schedule of weighted-average assumptions used to determine net periodic benefit costs |
|  | Years Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Discount rate |  |  | N/A |  |  | 4.9 | % |  | 4.0 | %
Long-term rate of return on assets |  |  | 4.0 | % |  | 6.0 | % |  | 6.0 | %
Schedule of the weighted average asset allocations by asset category | There were no plan assets outstanding as of December 31, 2015. The weighted average asset allocations by asset category as of December 31, 2014 were as follows:
Asset Category |  |  |
Equity securities |  |  | 4.2 | %
Debt securities |  |  | 94.0 |
Other |  |  | 1.8 |
​ | ​ | ​ | ​ | ​
Total |  |  | 100.0 | %
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Schedule of the investments in the pension plan measured at fair value |
|  | December 31, 2014 |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |
Money market funds |  | $ | 2.0 |  | $ | — |  | $ | — |  | $ | 2.0 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. equity securities(a) |  |  | 3.2 |  |  | — |  |  | — |  |  | 3.2 |
Non-U.S. equity securities(a) |  |  | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
Other equity securities(b) |  |  | 0.5 |  |  | — |  |  | — |  |  | 0.5 |
Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government |  |  | — |  |  | — |  |  | — |  |  | — |
U.S. and non-U.S. corporate(c) |  |  | — |  |  | 110.7 |  |  | — |  |  | 110.7 |
Other investments(d) |  |  | 1.3 |  |  | — |  |  | — |  |  | 1.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total investments |  | $ | 8.2 |  | $ | 110.7 |  | $ | — |  | $ | 118.9 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(a) | Included investments in common stock from diverse industries
(b) | Included investments in index and exchange-traded funds
(c) | Includes investment grade bonds from diverse industries
(d) | Included investments in real estate investment funds, exchange- traded funds, commodity mutual funds and accrued interest
Information related to the company's pension funds cash flow |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (in millions) |
Employer Contributions |  | $ | 43.8 |  | $ | 0.7 |
Benefit Payments |  | $ | 3.8 |  | $ | 5.1 |

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