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Summary of Significant Accounting Policies - Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2021 shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) offering_period $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Employee stock-based awards |  |  |  |  |  |
Contractual term of awards |  |  |  | 3 years |  |
Stock-based compensation | $ |  | $ 11,341 | $ 10,953 | $ 61,001 | $ 37,674 | $ 35,654
Stock-based compensation expense (income), net of tax | $ |  |  |  | $ 59,243 | $ 36,584 | 33,103
Award vesting period |  |  |  | 3 years |  |
Total amount of common stock reserved and available for issuance pursuant to awards granted under the 2014 Plan (in shares) |  |  |  | 20,750,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Employee stock purchase plan, shares available for grant (in shares) |  |  |  | 9,055,756 |  |
Employee stock-based awards, unrecognized compensation costs on nonvested awards | $ |  | $ 85,449 |  | $ 42,559 |  |
Employee stock-based awards, weighted average recognition period |  |  |  | 1 year 10 months 24 days |  |
Performance Units Original Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 873,235 | 1,073,209 | 1,073,209 |  |
Granted (in shares) |  |  |  | 488,953 |  |
Vested (in shares) |  |  |  | (630,151) |  |
Forfeited (in shares) |  |  |  | (58,776) |  |
Non-vested at the end of the period (in shares) |  |  |  | 873,235 | 1,073,209 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |
Total fair value of shares or units vested | $ |  | $ 18,415 | $ 19,861 | $ 29,332 | $ 26,492 | 21,191
PUs Adjustment |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | (541,444) | (319,508) | (319,508) |  |
Granted (in shares) |  |  |  | 0 |  |
Vested (in shares) |  |  |  | 0 |  |
Forfeited (in shares) |  |  |  | (221,936) |  |
Non-vested at the end of the period (in shares) |  |  |  | (541,444) | (319,508) |
Performance Units |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |
Aggregate intrinsic value |  |  |  |  |  |
Total fair value of shares or units vested | $ |  | $ 4,346 | $ 5,591 | $ 29,701 | $ 11,812 | $ 6,503
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 331,791 | 753,701 | 753,701 |  |
Granted (in shares) |  |  |  | 488,953 |  |
Vested (in shares) |  |  |  | (630,151) |  |
Forfeited (in shares) |  |  |  | (280,712) |  |
Non-vested at the end of the period (in shares) |  |  |  | 331,791 | 753,701 |
Weighted average grant date fair value |  |  |  |  |  |
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share) | $ / shares |  | $ 44.65 | $ 36.98 | $ 36.98 |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  |  | 54.61 |  |
Weighted average grant date fair value, vested (in dollars per share) | $ / shares |  |  |  | 47.13 |  |
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares |  |  |  | 35.84 |  |
Weighted average grant date fair value, non-vested, end of period (in dollars per share) | $ / shares |  |  |  | $ 44.65 | $ 36.98 |
Performance units disclosure |  |  |  |  |  |
Period of anniversary from the date of grant |  |  |  | 3 years |  |
Qualifying service period |  |  |  | 3 years |  |
Performance Units | Revenue or revenue growth and return on invested capital |  |  |  |  |  |
Performance units disclosure |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |
Performance Units | Minimum | Market condition associated with shareholder return of common stock |  |  |  |  |  |
Performance units disclosure |  |  |  |  |  |
Percentage payout rate |  |  |  | 0.00% |  |
Performance Units | Maximum | Market condition associated with shareholder return of common stock |  |  |  |  |  |
Performance units disclosure |  |  |  |  |  |
Percentage payout rate |  |  |  | 238.00% |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Employee stock purchase plan, number of offering periods | offering_period |  |  |  | 2 |  |
Employee stock purchase plan, offering periods |  |  |  | 6 months |  |
Employee stock purchase plan, maximum employee subscription rate percent |  |  |  | 15.00% |  |
Percentage of market price for the purchase of shares |  |  |  | 95.00% |  |
Employee stock purchase plan, shares issued in period (in shares) |  |  |  | 112,297 | 159,853 | 129,505
Employee stock purchase plan, shares available for grant (in shares) |  |  |  | 1,103,990 |  |
Employee stock purchase plan, duration of offering periods |  |  |  | 6 months |  |
Three Year Vesting Option |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Contractual term of awards |  |  |  | 10 years |  |
Award vesting period |  |  |  | 3 years |  |
Employee And Non Employees Stock Option |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  | $ 3.23 | $ 2.35 | $ 3.58
Weighted average assumptions used for grants |  |  |  |  |  |
Expected volatility (as a percent) |  |  |  | 28.30% | 25.40% | 24.30%
Risk-free interest rate (as a percent) |  |  |  | 1.45% | 1.45% | 2.47%
Expected dividend yield (as a percent) |  |  |  | 7.00% | 7.00% | 7.00%
Expected life of the option |  |  |  | 10 years | 10 years | 5 years
Summary of option activity |  |  |  |  |  |
Options outstanding balance, beginning of period (in shares) |  | 4,224,073 | 4,732,519 | 4,732,519 |  |
Options granted (in shares) |  |  |  | 429,618 |  |
Options exercised (in shares) |  |  |  | (869,855) |  |
Options forfeited (in shares) |  |  |  | (16,304) |  |
Options expired (in shares) |  |  |  | (51,905) |  |
Options outstanding balance, end of period (in shares) |  |  |  | 4,224,073 | 4,732,519 |
Options exercisable balance (in shares) |  |  |  | 3,168,908 |  |
Options expected to vest (in shares) |  |  |  | 1,054,641 |  |
Weighted Average Exercise Price |  |  |  |  |  |
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share) | $ / shares |  | $ 36.06 | $ 35.83 | $ 35.83 |  |
Weighted average exercise price, options granted (in dollars per share) | $ / shares |  |  |  | 34.73 |  |
Weighted average exercise price, options exercised (in dollars per share) | $ / shares |  |  |  | 34.26 |  |
Weighted average exercise price, options forfeited (in dollars per share) | $ / shares |  |  |  | 35.37 |  |
Weighted average exercise price, options expired (in dollars per share) | $ / shares |  |  |  | 34.27 |  |
Weighted average exercise price, options outstanding balance end of period (in dollars per share) | $ / shares |  |  |  | 36.06 | $ 35.83 |
Weighted average exercise price, options exercisable (in dollars per share) | $ / shares |  |  |  | 36.60 |  |
Weighted average exercise price, options expected to vest (in dollars per share) | $ / shares |  |  |  | $ 34.42 |  |
Weighted average remaining contractual term |  |  |  |  |  |
Weighted average remaining contractual term, options outstanding |  |  |  | 5 years 9 months |  |
Weighted average remaining contractual term, options exercisable |  |  |  | 4 years 10 months 24 days |  |
Weighted average remaining contractual term, options expected to vest |  |  |  | 8 years 4 months 2 days |  |
Aggregate intrinsic value |  |  |  |  |  |
Aggregate intrinsic value, options outstanding | $ |  |  |  | $ 68,747 |  |
Aggregate intrinsic value, options exercisable | $ |  |  |  | 49,850 |  |
Aggregate intrinsic value, options expected to vest | $ |  |  |  | $ 18,888 |  |
Restricted Stock And Restricted Stock Units |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 1,403,633 | 1,294,006 | 1,294,006 |  |
Granted (in shares) |  |  |  | 1,178,170 |  |
Vested (in shares) |  |  |  | (862,377) |  |
Forfeited (in shares) |  |  |  | (206,166) |  |
Non-vested at the end of the period (in shares) |  |  |  | 1,403,633 | 1,294,006 |
Weighted average grant date fair value |  |  |  |  |  |
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share) | $ / shares |  | $ 34.11 | $ 33.02 | $ 33.02 |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  |  | 34.98 |  |
Weighted average grant date fair value, vested (in dollars per share) | $ / shares |  |  |  | 34.01 |  |
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares |  |  |  | 32.65 |  |
Weighted average grant date fair value, non-vested, end of period (in dollars per share) | $ / shares |  |  |  | $ 34.11 | $ 33.02 |
Performance Units Original Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 425,777 | 380,856
2014 Plan |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Total amount of common stock reserved and available for issuance pursuant to awards granted under the 2014 Plan (in shares) |  |  |  | 20,750,000 | 12,750,000 |
Employee Stock Purchase Plan |  |  |  |  |  |
Shares of our common stock authorized for issuance (in shares) |  |  |  | 8,000,000 |  |
2013 Employee Stock Purchase Plan | Employee Stock Purchase Plan |  |  |  |  |  |
Employee stock-based awards |  |  |  |  |  |
Total amount of common stock reserved and available for issuance pursuant to awards granted under the 2014 Plan (in shares) | 1,000,000 |  |  | 2,000,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Shares of our common stock authorized for issuance (in shares) | 1,000,000 |  |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Name: | us-gaap_PlanNameAxis=irm_A2013EmployeeStockPurchasePlanMember
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Data Type: | na
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