Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions				1 Months Ended					12 Months Ended
	Jan. 28, 2021	Jan. 11, 2021	Oct. 28, 2019	Feb. 12, 2021	Jan. 31, 2021	Dec. 31, 2020	Apr. 30, 2019	Feb. 28, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2019	Jan. 31, 2018
Subsequent Event [Line Items]
Loss on extinguishment of debt						$ 55,000,000.0			$ 55,000,000.0	$ 15,300,000	$ 0
Stock Repurchase Program 2018
Subsequent Event [Line Items]
Stock repurchased (in Shares)							11.6	29.3	16.1
Amount			$ 160,000,000.0						$ 375,000,000.0	$ 550,000,000.0
Shares repurchased (in shares)									17.9	20.1
Stock repurchase program, authorized amount												$ 3,000,000,000.0	$ 2,000,000,000.0
4.350% fixed-rate notes ("2025-I Notes") | Senior Notes
Subsequent Event [Line Items]
Debt redemption, amount						142,000,000.0			$ 142,000,000.0
4.500% fixed-rate notes (2024 Notes) - Issued March 2014 | Senior Notes
Subsequent Event [Line Items]
Debt redemption, amount						$ 234,200,000			$ 234,200,000
Subsequent Event
Subsequent Event [Line Items]
Loss on extinguishment of debt		$ 60,600,000
Cash dividends declared per share of common stock (in usd per share)	$ 0.20
Subsequent Event | Stock Repurchase Program 2018
Subsequent Event [Line Items]
Stock repurchased (in Shares)				2.5
Amount				$ 61,700,000
Price paid per share (in usd per share)				$ 24.94
Shares repurchased (in shares)				2.0
Stock repurchase program, authorized amount				$ 1,300,000,000
Subsequent Event | Senior Notes
Subsequent Event [Line Items]
Redemption price		482,100,000
Subsequent Event | 4.350% fixed-rate notes ("2025-I Notes") | Senior Notes
Subsequent Event [Line Items]
Debt redemption, amount		158,000,000.0
Subsequent Event | 4.500% fixed-rate notes (2024 Notes) - Issued March 2014 | Senior Notes
Subsequent Event [Line Items]
Debt redemption, amount		$ 265,800,000
Subsequent Event | Apstra
Subsequent Event [Line Items]
Consideration transferred					$ 180,000,000