v3.8.0.1

Stock-Based Compensation Stock Based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax compensation expense | $ 48.6 | $ 45.3 | $ 35.2
Income tax benefit | (16.0) | (15.1) | (11.8)
Total stock-based compensation expense | 32.6 | 30.2 | 23.4
Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax compensation expense | 29.4 | 28.1 | 22.5
Income tax benefit | (9.6) | (9.3) | (7.5)
Total stock-based compensation expense | 19.8 | 18.8 | 15.0
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax compensation expense | 19.2 | 17.2 | 12.7
Income tax benefit | (6.4) | (5.8) | (4.3)
Total stock-based compensation expense | $ 12.8 | $ 11.4 | $ 8.4

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