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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 0.7 | $ 0.8 | $ 1.5 | $ 1.5
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.7 | 3.1 | 5.4 | 5.8
Restricted Stock [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.2 | 0.0 | 0.5 | 0.0
Share-based Payment Arrangement [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 2.9 | 3.1 | $ 5.9 | 5.8
Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | 1,111 |  | 443,497 |
Total Shareholder Return [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 2.3 | 2.1 | $ 4.5 | 4.1
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 0.4 | $ 1.0 | $ 0.9 | $ 1.7

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