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Stockholders' Equity (Details 2) - USD ($) shares in Millions, $ in Millions		3 Months Ended
	Oct. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
2020 Accelerated share repurchase program
Accelerated share repurchases
Accelerated share repurchase program, upfront payment			$ 50.0
Repurchase and retirement of common stock under repurchase program, shares		(0.1)	(2.6)
Repurchase and retirement of common stock under repurchase program			$ (40.0)
Remaining initial payment, unsettled forward contract indexed to Company's stock			$ 10.0
2021 Accelerated share repurchase program
Accelerated share repurchases
Accelerated share repurchase program, upfront payment		$ 100.0
Repurchase and retirement of common stock under repurchase program, shares	(0.4)	(3.9)
Repurchase and retirement of common stock under repurchase program		$ (80.0)
Remaining initial payment, unsettled forward contract indexed to Company's stock		$ 20.0

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