Share-Based Compensation - Allocation of Compensation Expense (Benefit) by Plan (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Share-Based Compensation | |||
Share-based compensation expense (benefit) before tax | $ 45.4 | $ (26.4) | $ 73.5 |
Share-based compensation capitalized as part of inventory | 0.7 | 0.7 | 0.4 |
Cumulative effect of accounting change | (5.1) | (5.1) | |
Stock Options | |||
Share-Based Compensation | |||
Share-based compensation expense (benefit) before tax | 70.5 | 58.5 | 43.0 |
Restricted Stock Units | |||
Share-Based Compensation | |||
Share-based compensation expense (benefit) before tax | 13.3 | 7.3 | 2.2 |
STAP awards | |||
Share-Based Compensation | |||
Share-based compensation expense (benefit) before tax | (39.7) | (93.4) | 27.1 |
Employee Stock Purchase Plan | |||
Share-Based Compensation | |||
Share-based compensation expense (benefit) before tax | 1.3 | $ 1.2 | $ 1.2 |
ASU 2016-09 | |||
Share-Based Compensation | |||
Cumulative effect of accounting change | $ (5.8) |