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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock-Based Compensation Activity |  |  |  |
Income tax benefit | $ 1.3 | $ 1.0 | $ 2.8 | $ 2.5
Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 4.6 | 3.9 | 10.0 | 9.7
Restricted Stock [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 0.3 | 0.0 | 0.8 | 0.0
Share-based Payment Arrangement [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 4.9 | 3.9 | $ 10.8 | 9.7
Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  |  | 443,900 |
Total Shareholder Return [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | 2.3 | 2.0 | $ 6.8 | 6.1
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |  |  |
Stock-Based Compensation Activity |  |  |  |
Compensation expense | $ 2.3 | $ 1.9 | $ 3.2 | $ 3.6

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