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Long-term Equity-based Compensation -Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract] |  |  |
Total fair value of DSUs that vested during the years | $ 0.9 | $ 0.5 | $ 0.1
Deferred Stock Units, Outstanding, Number, Period Start (in shares) | 21,520 |  |
Deferred Stock Units, Granted and Vested in Period (in shares) | 23,040 |  |
Deferred Stock Units, Outstanding, Number, Period End (in shares) | 44,560 | 21,520 |
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period Start (per share) | $ 32.68 |  |
Deferred Stock Units, Granted and Vested in Period, Weighted Average Exercise Price (per share) | 38.20 |  |
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period End (per share) | $ 35.54 | $ 32.68 |

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- Definition Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract] + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Unit, Vested in Period, Fair Value + References No definition available. + Details
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- Definition Number of share units granted and vested during the period. + References No definition available. + Details
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- Definition Weighted average price at which guarantees can acquire the stock units issued under the deferred stock unit plan. + References No definition available. + Details
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- Definition Weighted average per unit amount at which guarantees can acquire stock units under the deferred stock unit plan. + References No definition available. + Details
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