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Stock Compensation Plans Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum period stock options, appreciation rights, restricted stock, and restricted stock units can be granted | 10 years |  |  |
Number of Years Stock Options are Exercisable After Grant Date | 10 years |  |  |
Number of shares available for grant | 23,600,000 |  |  |
Long-term incentive plan liability | $ 15.0 | $ 17.0 |  |
Stock options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation vesting period | 4 years |  |  |
Unrecognized stock compensation expense | $ 0.0 |  |  |
Aggregate instrinsic value of stock options exercised | 10.5 | $ 11.7 | $ 31.1 |
Intrinsic value of outstanding stock options | $ 0.5 |  |  |
Exercise price (in dollars per share) | $ 8 | $ 12 | $ 11 | $ 12
Restricted stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation vesting period | 3 years |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units outstanding vested but not yet paid | 200,000 |  |  |
Restricted Stock, Performance Shares, and Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized stock compensation expense | $ 19.7 |  |  |
Restricted stock shares vested during period, total fair value | $ 20.0 | $ 17.1 | $ 15.0 |
Weighted average period in which stock based compensation costs are expensed | 2 years |  |  |
Field long-term compensation plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation vesting period | 3 years |  |  |
Senior management long-term compensation plan [Member] [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock compensation plan price floor | $ 5.00 |  |  |

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