Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail) $ in Millions					3 Months Ended			12 Months Ended
	Mar. 15, 2023 USD ($) shares	May 10, 2022 shares	Mar. 15, 2022 USD ($) shares	Mar. 16, 2021 USD ($) shares	Mar. 31, 2023 shares	Mar. 31, 2022 shares	Mar. 31, 2021 shares	Dec. 31, 2023 USD ($) TIME shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 shares	Mar. 12, 2020 USD ($) shares	Mar. 14, 2019 USD ($) shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding | shares								7,900,000	8,300,000	7,500,000
Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Performance awards period, years								1 year
Restricted Stock Units (RSUs) [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares					390,000	641,000	314,000	396,913	650,355	326,584
Fair value of grants in period								$ 67.0	$ 99.4	$ 40.1
Share based payment award vesting date					Mar. 15, 2028	Mar. 15, 2027	Mar. 16, 2026
Period of service from grant date stock options awarded not subject to forfeiture					2 years	2 years	2 years
Restricted stock or unit expense								43.4	36.4	26.7
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance					55 years	55 years	55 years
Unvested Restricted Stock [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Total intrinsic value								468.5	401.3
Equity awards with an aggregate fair value								62.2	62.0
Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Restricted stock or unit expense								20.0	15.2	15.9
Total intrinsic value								75.2	62.7
Equity awards with an aggregate fair value								$ 28.9	21.8	19.1
Performance share awards approved, Fair value	$ 10.3		$ 8.6	$ 8.6
Vesting period, years	2 years		2 years	2 years
Performance Shares [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance	55 years		55 years	55 years
2017 Performance Share Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional awards, terms								The 2023, 2022 and 2021 awards are subject to a three-year performance period that begins on January 1, 2023, 2022 and 2021, respectively, and vest on the three-year anniversary of the date of grant (March 15, 2026, March 15, 2025 and March 16, 2024).
Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares								0
Cash Awards [Member] | Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional awards, terms								The ultimate award value will be equal to the trailing twelve‑month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date.
Vesting period, years								3 years
Provisional compensation cash awards approved for future grant by compensation committee, value			$ 19.9	$ 18.8										$ 18.4	$ 16.5
Provisional compensation cash award approved for future grant by compensation committee, units | shares			125,000	147,000	122,000	143,000	208,000						200,000	213,000	206,800
Ultimate award value, multiples of original value of the units, minimum | TIME								0.5
Ultimate award value, multiples of original value of the units, maximum | TIME								1.5
2021 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses								$ 13.1	12.4	0.0
Performance awards expiration date								Jan. 01, 2024
2020 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares								191,000
Cash-based compensation awards, expenses									$ 12.1	12.6	$ 0.0
Performance awards expiration date								Jan. 01, 2023
Cash award with aggregate fair value vested and distributed to participants								$ 24.7
2019 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares									177,000
Cash-based compensation awards, expenses										$ 11.5	$ 10.6	$ 0.0
Performance awards expiration date								Jan. 01, 2022
Cash award with aggregate fair value vested and distributed to participants									$ 21.1
2018 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares										176,300
Cash award with aggregate fair value vested and distributed to participants										$ 17.7
2022 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses								$ 13.4	$ 0.0
Performance awards expiration date								Jan. 01, 2025
Long Term Incentive Plan [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding, Value								$ 4.0
Shares granted in the period | shares		3,500,000						2,800,000
Long Term Incentive Plan [Member] | Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares authorized | shares	58,000		54,000	67,000