Equity - Summary of Dividends Paid and Stock Repurchases and Retirements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends:
Per share (in dollars per share)	$ 0.20	$ 0.20
Amount	$ 65.2	$ 65.5
Repurchased under the 2018 Stock Repurchase Program:
Amount	$ 131.9	243.2
Forward contract under ASR		$ 40.0
Stock Repurchase Program 2018
Repurchased under the 2018 Stock Repurchase Program:
Shares (in shares)	5.1	10.3
Average price (in usd per share)	$ 24.45	$ 23.83
Amount	$ 125.0	$ 200.0