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Stockholders’ Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			6 Months Ended	9 Months Ended
	Jun. 07, 2019	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	May 06, 2020	Aug. 06, 2014
Class of Stock [Line Items]
Value of additional shares authorized to be repurchased								$ 200.0
Remaining authorized repurchase amount								$ 333.3	$ 133.3
Repurchases of common stock						$ 110.4
Average cost per share (in dollars per share)						$ 68.29
Employee Stock Purchase Plan | Employee Stock Option
Class of Stock [Line Items]
Number of exercisable options					1,300,000
Shares issued under employee stock purchase plan (in shares)			13,214		13,291	17,720	12,638
Price per share (in dollars per share)		$ 56.81	$ 63.21	$ 66.26	$ 61.64	$ 56.81	$ 66.26
Compensation costs		$ 0.2		$ 0.1		$ 0.5
Private Placement
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares)	1,600,000
Sale of stock, price per share (in dollars per share)	$ 83.00
Gross proceeds from issuance of common stock	$ 128.9
Payments of stock issuance costs	1.7
Common Stock
Class of Stock [Line Items]
Repurchases of common stock (in shares)						1,600,000
Repurchases of common stock						$ 0.2
Accrued Liabilities and Other Liabilities | Private Placement
Class of Stock [Line Items]
Payments of stock issuance costs	$ 0.3

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