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Base principal amount per note.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Indebtedness (Details Textual)		1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
Indebtedness (Details Textual)	Jun. 01, 2020 USD ($) d $ / shares shares	Mar. 31, 2020 USD ($) d $ / shares shares	Feb. 29, 2020 USD ($)	Mar. 31, 2016 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) d	Jun. 30, 2019 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2019 USD ($)	Mar. 18, 2016 $ / shares shares
Debt Instrument [Line Items]
Proceeds from issuance of convertible debt, net of issuance costs							$ 874,404,000
Cash proceeds from the sale of warrants							93,915,000
Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 550,000,000.0
Credit facility, expiration date			2025-02
Loan outstanding					$ 0		0			$ 0
Revolving Senior Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			0.50%
Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			1.00%
Multicurrency Borrowings [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 250,000,000.0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			50,000,000.0
Swing Line Loans [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 5,000,000.0
2021 Warrants [Member]
Debt Instrument [Line Items]
Cash proceeds from the sale of warrants				$ 44,900,000
Warrant strike price \| $ / shares											$ 80.00
2023 Warrants [Member]
Debt Instrument [Line Items]
Cash proceeds from the sale of warrants	$ 46,800,000
Warrant strike price \| $ / shares	$ 104.84
2025 Warrants [Member]
Debt Instrument [Line Items]
Cash proceeds from the sale of warrants		$ 47,100,000
Warrant strike price \| $ / shares		$ 127.84
2021 Hedge [Member]
Debt Instrument [Line Items]
Number of common stock to be purchased \| shares				10,865,270
Stock price \| $ / shares				$ 59.82
Derivative, maturity date				Mar. 15, 2021
2023 Hedge [Member]
Debt Instrument [Line Items]
Number of common stock to be purchased \| shares	5,345,010
Stock price \| $ / shares	$ 84.19
Cost of hedge transaction	$ 69,500,000
Derivative, maturity date	Jun. 01, 2023
2025 Hedge [Member]
Debt Instrument [Line Items]
Number of common stock to be purchased \| shares		4,823,910
Stock price \| $ / shares		$ 93.29
Derivative, maturity date		Mar. 15, 2025
Minimum [Member] \| Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Unused line fee			0.35%
Minimum [Member] \| Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			1.50%
Minimum [Member] \| Revolving Senior Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			0.50%
Minimum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year				2021-06
Minimum [Member] \| 2023 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year	2023-09
Minimum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year		2025-06
Maximum [Member] \| Revolving Senior Credit Facility [Member]
Debt Instrument [Line Items]
Unused line fee			0.50%
Maximum [Member] \| Revolving Senior Credit Facility [Member] \| Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			2.25%
Maximum [Member] \| Revolving Senior Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Credit facility bear interest rate			1.25%
Maximum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year				2021-12
Maximum [Member] \| 2023 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year	2023-11
Maximum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Class of warrant or rights expiry month and year		2025-10
Additional Paid-in Capital [Member] \| 2021 Hedge [Member]
Debt Instrument [Line Items]
Cost of hedge transaction				$ 111,200,000
Additional Paid-in Capital [Member] \| 2025 Hedge [Member]
Debt Instrument [Line Items]
Cost of hedge transaction					78,300,000		78,300,000
Common Stock [Member] \| Maximum [Member] \| 2021 Warrants [Member]
Debt Instrument [Line Items]
Number of preferred or common stock into which the warrants is converted \| shares											10,865,270
Common Stock [Member] \| Maximum [Member] \| 2023 Warrants [Member]
Debt Instrument [Line Items]
Number of preferred or common stock into which the warrants is converted \| shares	3,093,500
Common Stock [Member] \| Maximum [Member] \| 2025 Warrants [Member]
Debt Instrument [Line Items]
Number of preferred or common stock into which the warrants is converted \| shares		4,823,910
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount				650,000,000.0	$ 650,000,000		$ 650,000,000			$ 650,000,000
Proceeds from issuance of convertible debt, net of issuance costs				$ 634,100,000
Interest rate on convertible notes				2.25%	2.25%		2.25%			2.25%
Debt instrument, maturity date				Mar. 15, 2021
Initial conversion rate adjustment, shares				16.7158
Principal amount of debt considered for conversion rate				$ 1,000
Initial conversion price of convertible notes \| $ / shares				$ 59.82
Contractual coupon interest expense					$ 3,700,000	$ 3,700,000	$ 7,300,000	$ 7,300,000
Amortization of debt discount (premium)					4,600,000	4,400,000	9,200,000	8,700,000
Amortization of debt issuance costs					$ 900,000	$ 800,000	$ 1,700,000	$ 1,500,000
Effective interest rate					5.80%		5.80%
Debt redemption price percentage							100.00%
Principal payments due					$ 0		$ 0
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Scenario Two [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d							5
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of conversion price							130.00%
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Minimum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d							20
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of conversion price							98.00%
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Maximum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d							30
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member] \| Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity									$ 84,800,000
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member]
Debt Instrument [Line Items]
Principal amount	$ 450,000,000.0
Proceeds from issuance of convertible debt, net of issuance costs	$ 436,200,000
Interest rate on convertible notes	1.00%
Debt instrument, maturity date	Jun. 01, 2023
Initial conversion rate adjustment, shares	11.8778
Principal amount of debt considered for conversion rate	$ 1,000
Initial conversion price of convertible notes \| $ / shares	$ 84.19
Contractual coupon interest expense					400,000		$ 400,000
Amortization of debt discount (premium)					1,500,000		1,500,000
Amortization of debt issuance costs					$ 300,000		$ 300,000
Effective interest rate					6.80%		6.80%
Fair value of embedded conversion derivative	$ 57,200,000
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member] \| Scenario Two [Member]
Debt Instrument [Line Items]
Principal amount of debt considered for conversion rate	$ 1,000
Consecutive trading days considered for debt conversion \| d	5
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of conversion price	130.00%
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member] \| Minimum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	20
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of conversion price	98.00%
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member] \| Maximum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d	30
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount		$ 450,000,000.0			$ 450,000,000		$ 450,000,000
Proceeds from issuance of convertible debt, net of issuance costs		$ 437,000,000.0
Interest rate on convertible notes		0.375%			0.375%		0.375%			0.375%
Debt instrument, maturity date		Mar. 15, 2025
Initial conversion rate adjustment, shares		10.7198
Principal amount of debt considered for conversion rate		$ 1,000
Initial conversion price of convertible notes \| $ / shares		$ 93.29
Contractual coupon interest expense					$ 400,000		$ 600,000
Amortization of debt discount (premium)					3,500,000		4,700,000
Amortization of debt issuance costs					$ 400,000		$ 600,000
Effective interest rate					4.90%		4.90%
Percentage of conversion price		130.00%
Debt redemption price percentage		100.00%
Principal payments due		$ 0
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Scenario Two [Member]
Debt Instrument [Line Items]
Principal amount of debt considered for conversion rate		$ 1,000
Consecutive trading days considered for debt conversion \| d		5
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d		20
Percentage of conversion price		130.00%
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Minimum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d		20
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d		30
Percentage of conversion price		98.00%
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Maximum [Member] \| Scenario One [Member]
Debt Instrument [Line Items]
Consecutive trading days considered for debt conversion \| d		30
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member] \| Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Amount reclassified to stockholders' equity							$ 78,300,000