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Share-Based Payments - Textual (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 27, 2020 | Jul. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average fair value per share (in dollars per share) |  |  |  | $ 15.48 | $ 15.45 | $ 14.57 |
Unrecognized compensation cost |  |  |  | $ 2,100,000 |  |  |
Intrinsic value of stock options exercised |  |  |  | $ 2,300,000 | $ 3,600,000 | $ 5,200,000 |
2016 Omnibus Performance Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for grant under the Plan (in shares) |  |  |  | 14,000,000 |  |  |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |
Vesting period |  |  |  | 3 years |  |  |
Share-based compensation expense |  |  |  | $ 1,500,000 | 1,400,000 | 1,100,000 |
Weighted-average recognition period for unrecognized compensation cost |  |  |  | 22 months |  |  |
Employment Based SARS |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted during the period (in shares) |  |  |  |  |  |  | 122,976
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 100,000 | $ 81,900,000 | 56,200,000 |
Weighted-average fair value per share of awards granted (in dollars per share) |  |  |  |  | $ 870.28 |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, share-based liabilities paid |  | $ 55,000,000 | $ 13,000,000 |  |  |  |
Number of remaining shares (in shares) |  |  |  |  | 115,545 |  |
Fair value of SARs |  |  |  |  | $ 101,000,000 |  |
Settled the acquisition shares upon payment | $ 101,000,000 |  |  |  |  |  |
Performance and Employment Based SARS |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted during the period (in shares) |  |  |  |  |  |  | 129,124
Value threshold for determining fair value of common stock |  |  |  | 400,000,000 |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 25,800,000 | $ 29,500,000 | $ 27,100,000 |
Weighted-average recognition period for unrecognized compensation cost |  |  |  | 20 months |  |  |
Weighted-average fair value per share of awards granted (in dollars per share) |  |  |  | $ 61.81 | $ 49.84 | $ 37.61 |
Unrecognized compensation cost related to unvested SARs |  |  |  | $ 35,200,000 |  |  |
Fair value of vested shares |  |  |  | $ 44,200,000 | $ 45,200,000 | $ 22,100,000 |
Awards issued during period (in shares) |  |  |  | 555,000 |  |  |
Non-employee Directors | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average fair value per share of awards granted (in dollars per share) |  |  |  | $ 65.39 | $ 64.48 | $ 62.88 |
Number of remaining shares (in shares) |  |  |  | 577,841 |  |  |
Awards issued during period (in shares) |  |  |  | 32,196 | 23,270 | 24,771 |
Compensation expense recognized |  |  |  | $ 2,100,000 | $ 1,500,000 | $ 1,600,000 |
Unrecognized compensation cost |  |  |  | $ 0 |  |  |
Non-employee Directors | Dividend Equivalent, RSU |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards issued during period (in shares) |  |  |  | 8,987 | 8,876 | 8,045 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Determination Based On Home Health Acquisitions, Value Threshold + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The number of grants made 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 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 Amount of cash paid to settle liability for award 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 (d)(2) -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 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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