Debt and Credit Facilities - Additional Information (Details)		1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2014 USD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) Extension $ / shares	Aug. 31, 2020 USD ($) d $ / shares shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) d $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Aug. 10, 2020 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding amount			$ 219,200,000		$ 219,200,000		$ 219,200,000		$ 193,100,000
Deferred tax liabilities			12,690,000		12,690,000		12,690,000		12,285,000
Deferred tax assets			147,146,000		147,146,000		147,146,000		130,200,000
Level 2
Debt Instrument [Line Items]
Senior notes, fair value			273,900,000		273,900,000		273,900,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, outstanding amount			200,000,000		200,000,000		200,000,000		200,000,000
Senior Note, Series A | Subsequent Event
Debt Instrument [Line Items]
Senior note, amount paid		$ 50,000,000
Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate				0.25%
Interest expense					700,000		$ 1,500,000		4,400,000
Debt amount				$ 400,000,000.0
Exercise of option by initial purchasers aggregate principal amount				50,000,000.0
Proceeds from issuance and sale of debt				389,700,000
Transaction fees and other third-party offering expenses				$ 10,300,000
Debt instrument, payment terms							The Convertible Senior Notes accrue interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021
Debt instrument, frequency of periodic payment							semi-annually
Maturity Date				Aug. 15, 2025
Convertible note converted each amount			$ 1,000		$ 1,000		$ 1,000
Convertible notes converted each into shares of common stock | shares							22.2913
Debt Instrument, conversion price | $ / shares			$ 44.86		$ 44.86		$ 44.86
Threshold trading days | d				20			51
Threshold consecutive trading days | d				30
Conversion percentage of stock price trigger				130.00%
Number of business day period				5 days
Consecutive trading day period				5 days
Convertible principal amount				$ 1,000
Measurement period, percentage				98.00%
Percentage of principal amount to redeem convertible senior notes				100.00%
Percentage of convertible senior notes repurchased at cash				100.00%
Debt liability				$ 336,100,000
Debt instrument convertible notes additional paid in capital				$ 53,600,000
Convertible senior notes effective interest rate				3.25%
Net carrying value of notes			$ 400,000,000.0		$ 400,000,000.0		$ 400,000,000.0		340,600,000
Bond hedge term							5 years
Number of shares issuable upon conversion | shares				8,900,000
Cost of convertible note hedge transaction				$ 55,000,000.0
Number of common stock acquired by offsetting sale warrants. | shares							8,900,000
Exercise price of warrants | $ / shares			$ 66.46		$ 66.46		$ 66.46
Cash proceeds from sales of warrants							$ 13,800,000
Convertible Senior Notes | ASU 2020-06
Debt Instrument [Line Items]
Reclassification of equity component of convertible senior notes to liabilities										$ 55,000,000.0
Reclassification of equity component of debt issuance costs to liabilities										$ 1,400,000
Carrying amount of convertible senior notes adjusted in retained earnings											$ 3,700,000
Convertible Note Hedge And Warrant Transaction
Debt Instrument [Line Items]
Purchase of bond hedges and sale of warrants				$ 41,200,000
Deferred tax liabilities			$ 16,200,000		$ 16,200,000		16,200,000
Deferred tax assets			16,500,000		16,500,000		16,500,000
Convertible Note Hedge And Warrant Transaction | ASU 2020-06
Debt Instrument [Line Items]
Deferred tax liability reversed			13,900,000		13,900,000		13,900,000
Additional deferred tax liability related to capitalized debt issuance costs			400,000		400,000		400,000
Adjustment to deferred tax asset through retained earnings			900,000		900,000		900,000
Private Placement
Debt Instrument [Line Items]
Debt issuance costs incurred	$ 1,100,000											$ 500,000
Debt amount	250,000,000.0
Private Placement | Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Interest payable			$ 5,500,000		5,500,000		5,500,000		$ 5,500,000
Private Placement | Senior Notes
Debt Instrument [Line Items]
Interest expense					3,100,000	$ 3,100,000	6,200,000	$ 6,200,000
Interest payments					6,200,000	6,200,000	6,200,000	6,200,000
Private Placement | Senior Note, Series A
Debt Instrument [Line Items]
Debt amount	$ 50,000,000
Maturity Date	Jul. 15, 2021
Minimum | Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares				$ 44.86
Percentage of bond hedge and warrant transactions increased conversion price				35.00%
Maximum | Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares				$ 66.46
Percentage of bond hedge and warrant transactions increased conversion price				100.00%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement date			Jun. 30, 2021
Revolving credit facility			$ 650,000,000		650,000,000		650,000,000
Debt issuance costs incurred			2,000,000.0		2,000,000.0		2,000,000.0
Revolving credit facility			$ 550,000,000		$ 550,000,000		$ 550,000,000
Credit agreement maturity period			5 years
Credit agreement number of extensions | Extension			2
Interest rate			1.34%		1.34%		1.34%		1.87%
Letters of credit outstanding amount			$ 45,000,000.0		$ 45,000,000.0		$ 45,000,000.0		$ 44,900,000
Interest expense					300,000	$ 300,000	500,000	$ 700,000
Debt instrument, outstanding amount			$ 0		$ 0		$ 0
Unsecured Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate							0.00%
Unsecured Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate							0.625%
Unsecured Revolving Credit Facility | Euro Currency Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate							1.00%
Unsecured Revolving Credit Facility | Euro Currency Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate							1.625%