Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions			1 Months Ended		12 Months Ended
	May 05, 2021	Oct. 24, 2011	Jul. 31, 2020 shares	Dec. 31, 2011 period shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax benefits related to share options exercised | $					$ 0.3	$ 1.9	$ 8.0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					4 years
Weighted-average grant-date fair value, RSUs and PRSUs granted (in dollars per share) | $ / shares					$ 118.41	$ 144.65	$ 152.08
Number of RSUs released (in shares)					1,341,000	1,094,000	910,000
Shares issued (in shares)					892,000	735,000	610,000
Shares withheld for tax purposes (in shares)					449,000	359,000	300,000
Total fair value of shares vested | $					$ 156.0	$ 155.5	$ 138.1
Unrecognized compensation cost related to unvested RSUs | $					$ 308.9
Unrecognized compensation cost, weighted-average period of recognition (in years)					2 years 4 months 24 days
GW Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)	2 years
Grants expiration period (in years)	10 years
Shares authorized for issuance (in shares)					1,864,475
GW Incentive Plans, Post Acquisition Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)	4 years
2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)				4 years
Shares authorized for issuance (in shares)					34,836,988
2011 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants expiration period (in years)				10 years
2007 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					7,029,250
ESPP discount rate (as a percentage)				15.00%
ESPP offering period (in months)				24 months
Number of purchase periods within each ESPP offering period | period				4
Number of shares available for issuance (in shares)				175,000
Unrecognized compensation cost, weighted-average period of recognition (in years)					1 year 1 month 6 days
2007 Directors Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares authorized for issuance under deferred compensation plan (in shares)			500,000
Shares authorized for issuance under deferred compensation plan (in shares)					1,403,938
2007 Directors Award Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)		3 years
Grants expiration period (in years)		10 years
2007 Directors Award Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods (in years)		1 year
Initial Grant | 2007 Directors Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Annual Automatic Grant | 2007 Directors Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		1 year