CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NON-CONTROLLING INTEREST - USD ($) $ in Millions	Total	Common stock Class B		Common stock Common stock		Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings	Retained earnings Adjustments	Noncontrolling Interest
Beginning balance at Dec. 31, 2018	$ 1,197.2	$ 0.1	[1]	$ 0.0	[1]	$ 35.0	$ 0.0	$ 1,162.1	$ 0.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation for stock and stock option issuances and excess tax benefits from option exercises				12.7		3.5
Issuance of stock in connection with employee stock plans				11.0
Repurchase of class A common stock				(3.2)
Option premium received (paid)						7.5		(5.1)
Foreign currency translation adjustment	0.0
Gain (loss) on cash flow hedges, net of tax (provision) benefit of $(1.6), $2.0 and $0.3	$ (0.7)
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Net income	$ 271.5							271.5
Dividends paid								(27.6)
Ending balance at Dec. 31, 2019	1,467.7	0.1	[1]	20.5	[1]	46.0	(0.7)	1,401.8	$ (4.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation for stock and stock option issuances and excess tax benefits from option exercises				11.6		11.6
Issuance of stock in connection with employee stock plans				13.3
Class B common stock converted to class A common stock		(0.1)		0.1
Repurchase of class A common stock				(34.4)		(16.2)
Equity issuances, net of issuance costs				777.1
Foreign currency translation adjustment	0.0
Gain (loss) on cash flow hedges, net of tax (provision) benefit of $(1.6), $2.0 and $0.3	(5.6)						(5.6)
Net income	470.3							470.3
Dividends paid								(29.1)
Ending balance at Dec. 31, 2020	2,661.5	$ 0.0	[1]	788.2	[1]	41.4	(6.3)	1,838.2		$ 0.0
Redeemable non-controlling interest, ending balances at Dec. 31, 2020	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation for stock and stock option issuances and excess tax benefits from option exercises				17.8		16.9
Issuance of stock in connection with employee stock plans				25.9
Repurchase of class A common stock				(230.7)
Equity issuances, net of issuance costs				1,110.4
Foreign currency translation adjustment	(1.1)						(1.1)
Gain (loss) on cash flow hedges, net of tax (provision) benefit of $(1.6), $2.0 and $0.3	4.4						4.4
Net income	1,062.7							1,060.1		1.7
Dividends paid								(38.8)
Issuance related to business combinations	33.1									1.1
Ending balance at Dec. 31, 2021	4,629.2			$ 1,711.6	[1]	$ 58.3	$ (3.0)	$ 2,859.5		2.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Acquired redeemable non-controlling interest	33.1									$ 1.1
Net income attributable to redeemable non-controlling interest	0.9
Redeemable non-controlling interest, ending balances at Dec. 31, 2021	$ 34.0

[1] Prior to June 7, 2021, common stock was classified as Class A common stock. The Class A common stock reclassification as common stock occurred in connection with the elimination of our classified common stock structure following the conversion of all Class B common stock to Class A common stock.