Stockholders' Equity - Stock Repurchase Program (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2018	Jan. 31, 2019	May 31, 2018	Jan. 30, 2016
Share Repurchase [Line Items]
Accelerated share repurchase program, authorized amount	$ 250,000,000.0	$ 250,000,000.0
Accelerated share repurchases, settlement (payment) or receipt	$ (250,000,000)	$ (250,000,000)
Accelerated share repurchases, initial shares repurchased (in shares)		1,529,286
Accelerated share repurchases, shares repurchased (in shares)	353,112	1,882,398
Accelerated share repurchases, final price paid (in usd per share)		$ 132.81
2018 Share Repurchase Program
Share Repurchase [Line Items]
Stock repurchase program, authorized amount				$ 1,000,000,000.0
Stock repurchase program, remaining authorized repurchase amount			$ 635,000,000
2016 Program
Share Repurchase [Line Items]
Stock repurchase program, authorized amount					$ 500,000,000.0
Stock repurchase program, remaining authorized repurchase amount					$ 154,900,000