Share-based Compensation - Stock Options - Additional Information (Details) - Stock options - USD ($)
$ / shares in Units, shares in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Share-based compensation Expense |
|
|
|
| Weighted average grant-date fair value of stock options granted (in dollars per share) |
$ 15.57
|
$ 30.47
|
$ 25.81
|
| Aggregate intrinsic value of stock options exercised |
$ 21,300,000
|
$ 35,500,000
|
$ 40,400,000
|
| Stock options expected to vest (in shares) |
5.2
|
|
|
| Weighted average exercise price (in dollars per share) |
$ 42.64
|
|
|
| Weighted average contractual remaining life |
8 years 6 months
|
|
|
| Aggregate intrinsic value of stock options exercisable |
$ 12,900,000
|
|
|
| Weighted average remaining contractual term of stock options exercisable |
4 years 6 months
|
|
|
| Unrecognized compensation cost |
$ 48,000,000.0
|
|
|
| Weighted average period for unrecognized compensation cost expected to be recognized |
1 year 10 months 24 days
|
|
|
| Cash received from option exercises |
$ 18,900,000
|
$ 20,900,000
|
$ 23,500,000
|
| Maximum |
|
|
|
| Share-based compensation Expense |
|
|
|
| Aggregate intrinsic value |
$ 100,000
|
|
|