Equity - Stock Repurchase Activities (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions						3 Months Ended												12 Months Ended
	Oct. 27, 2020	Jul. 28, 2020	Apr. 28, 2020	Jan. 27, 2020	Oct. 28, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends
Per Share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20		$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.80	$ 0.76	$ 0.72
Amount																		$ 264.1	$ 260.1	$ 249.3
Stock Repurchases
Remaining forward contract, value																		$ 40.0
Stock Repurchase Program 2018
Stock Repurchases
Shares (in shares)																		17.9	20.1
Average price per share (in dollars per share)																		$ 23.47	$ 25.36
Amount					$ 160.0													$ 375.0	$ 550.0
Tax Withholding Amount																		6.2	5.0
Amount																		$ 645.3	$ 815.1
Stock Repurchase Program 2014
Stock Repurchases
Shares (in shares)																				29.3
Average price per share (in dollars per share)																				$ 25.62
Amount																				$ 750.0
Tax Withholding Amount																				6.6
Amount																				$ 1,005.9