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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock based compensation expense, accelerated vesting |  |  |  | $ 9.6 | $ 29.4
Purchase price of common stock, percent of market value, not less than |  |  | 100.00% |  |
Stock based compensation expense |  |  | $ 121.7 | 104.5 | 133.8
Nonvested options granted, unrecognized compensation expense |  |  | $ 61.9 |  |
Nonvested options granted, period for recognition |  |  | 1 year 8 months 12 days |  |
Options exercised, total intrinsic value |  |  | $ 155.4 | 109.4 | $ 124.6
Proceeds from stock options exercised |  |  | $ 105.5 | $ 64.9 |
Nonvested shares granted (in shares) |  |  | 285 | 321 |
Nonvested awards other than options granted, unrecognized compensation expense |  |  | $ 89.8 |  |
Nonvested awards other than options granted, weighted average period for recognition |  |  | 1 year 8 months 12 days |  |
Stock issued during period under employee stock purchase plan (in shares) |  |  | 31 | 21 | 20
Proceeds from issuance of shares under employee stock purchase plan |  |  | $ 10.5 | $ 6.8 | $ 5.4
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum designated percent of eligible earnings per employee | 10.00% | 10.00% |  |  |
Discount percent | 10.00% | 5.00% |  |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period |  |  | 10 years |  |
Stock based compensation expense |  |  | $ 41.4 | 32.0 | 23.2
Stock options | Weighted Average |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock based compensation expense |  |  | $ 79.4 | $ 72.5 | $ 109.7
Restricted stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Restricted stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Incentive Plan 2016 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant (in shares) |  |  | 3,254 |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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