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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Jun. 30, 2021
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Payment activity [Roll Forward] |  |  |  |  |  |  |  |
Unvested at beginning of period (in shares) | 786,800 | 912,400 |  | 940,300 | 1,096,200 |  | 912,400 | 1,096,200
Granted (in shares) | 188,500 |  |  | 200,500 |  |  | 188,500 | 257,100
Vested (in shares) | (28,600) |  |  | (10,700) |  |  | (151,400) | (218,100)
Forfeited (in shares) | (7,700) |  |  | (12,000.0) |  |  | (10,500) | (17,100)
Unvested at end of period (in shares) | 939,000.0 | 786,800 | 912,400 | 1,118,100 | 940,300 | 1,096,200 | 939,000.0 | 1,118,100
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Payment activity [Roll Forward] |  |  |  |  |  |  |  |
Unvested at beginning of period (in shares) | 466,100 | 646,000.0 |  | 439,100 | 531,500 |  | 646,000.0 | 531,500
Granted (in shares) | 113,000.0 |  |  | 107,200 |  |  | 113,000.0 | 107,200
Vested (in shares) | 0 |  |  | 0 |  |  | (175,100) | (79,000.0)
Forfeited (in shares) | (2,200) |  |  | (1,100) |  |  | (7,000.0) | (14,500)
Unvested at end of period (in shares) | 576,900 | 466,100 | 646,000.0 | 545,200 | 439,100 | 531,500 | 576,900 | 545,200
Share-based Payment Arrangement [Member] |  |  |  |  |  |  |  |
Share-based Payment activity [Roll Forward] |  |  |  |  |  |  |  |
Unvested at beginning of period (in shares) | 1,252,900 | 1,558,400 |  | 1,379,400 | 1,627,700 |  | 1,558,400 | 1,627,700
Granted (in shares) | 301,500 |  |  | 307,700 |  |  | 301,500 | 364,300
Vested (in shares) | (28,600) |  |  | (10,700) |  |  | (326,500) | (297,100)
Forfeited (in shares) | (9,900) |  |  | (13,100) |  |  | (17,500) | (31,600)
Unvested at end of period (in shares) | 1,515,900 | 1,252,900 | 1,558,400 | 1,663,300 | 1,379,400 | 1,627,700 | 1,515,900 | 1,663,300
Share-based Payment activity, additional disclosures [Abstract] |  |  |  |  |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 152.62 | $ 152.27 |  | $ 134.84 | $ 137.42 |  | $ 152.27 | $ 137.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | 224.59 |  |  | 186.21 |  |  | 223.61 | 179.95
Weighted average grant date fair value, vested (in dollars per share) | 129.96 |  |  | 142.07 |  |  | 147.57 | 150.45
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | 173.02 |  |  | 123.85 |  |  | 173.44 | 138.47
Weighted average grant date fair value, end of period (in dollars per share) | $ 167.23 | $ 152.62 | $ 152.27 | $ 144.01 | $ 134.84 | $ 137.42 | $ 167.23 | $ 144.01
Weighted average remaining contractual life, unvested shares outstanding | 1 year 11 months 23 days | 1 year 10 months 2 days | 1 year 11 months 26 days | 1 year 11 months 1 day | 1 year 8 months 12 days | 1 year 8 months 8 days | 1 year 11 months 23 days | 1 year 11 months 1 day
Unamortized deferred compensation cost | $ 121.8 |  |  |  |  |  | $ 121.8 |

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- Definition Amount of cost not yet recognized for nonvested 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of 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 (c)(2)(i)-(ii) -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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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