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Plan Information (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Deferred Compensation Liability, Current and Noncurrent | $ 196.2 | $ 213.2
Incentive compensation plan initiation year | 2014 |
Number of shares initially available for grant | 28.8 |
Maximum shares participants are eligible to receive | 2.0 |
Maximum cash award per employee | $ 10.0 |
Number of years stock options expire from grant date | 10 years |
Vesting period in which the fair value of shares on grant date is amortized over, years | 3 years |
Minimum [Member] |  |
Stock options exercisable period | 2 years |
Maximum [Member] |  |
Stock options exercisable period | 4 years |

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