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Employee Benefit Plans - Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Pension Plans |  |
Estimated increase (decrease) in 2017 pension cost |  |
0.50% increase in discount rate | $ (0.8) |
0.50% decrease in discount rate | 0.9 |
0.50% increase in long-term return on assets | (0.7) |
0.50% decrease in long-term return on assets | 0.7 |
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2016 |  |
0.50% increase in discount rate |  | $ (13.6)
0.50% decrease in discount rate |  | 14.9
Postretirement Health and Other |  |
Estimated increase (decrease) in 2017 pension cost |  |
0.50% increase in discount rate | 0.0 |
0.50% decrease in discount rate | 0.1 |
1% increase in medical trend rates | 0.7 |
1% decrease in medical trend rates | $ (0.3) |
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2016 |  |
0.50% increase in discount rate |  | (1.5)
0.50% decrease in discount rate |  | 1.6
1% increase in medical trend rates |  | 3.7
1% decrease in medical trend rates |  | $ (3.3)

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