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Debt - Convertible Note Hedge and Warrant Transactions (Details) $ / shares in Units, shares in Thousands, $ in Millions	Jul. 27, 2019 $ / shares	Sep. 15, 2015 USD ($) shares $ / shares
Convertible Note Hedge
Debt Instrument [Line Items]
Derivative, Number of Instruments Held | shares		5,006
Debt instrument, convertible, conversion price (per share)	$ 96.89	$ 96.89
Deferred tax liability | $		$ 43.4
Deferred tax asset, derivative instrument | $		$ 43.2
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price (per share)		$ 96.89
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) | shares		5,006
Class of warrant or right, exercise price of warrants or rights (per warrant)		$ 130.43

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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