Debt - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Oct. 28, 2017	Sep. 15, 2015
Convertible Note Hedge
Debt Instrument [Line Items]
Derivative, Number of Instruments Held		5,006
Debt instrument, convertible, conversion price (per share)	$ 96.89	$ 96.89
Deferred Tax Liabilities, Derivatives		$ 43.4
Deferred Tax Assets, Derivative Instruments		$ 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)		5,006
Class of earrant or right, exercise price of warrants or rights (per warrant)	$ 130.43	$ 130.43