Equity - Summary of Dividends Paid and Stock Repurchases and Retirements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Dividends
Per share (in dollars per share)	$ 0.20	$ 0.19	$ 0.40	$ 0.38
Amount	$ 66.3	$ 65.5	$ 131.8	$ 131.7
Repurchased under the 2018 Stock Repurchase Program
Amount	$ 2.1	240.9	245.3	243.8
Forward contract under ASR		$ 60.0	$ 40.0	$ 60.0
Stock Repurchase Program 2018
Repurchased under the 2018 Stock Repurchase Program
Shares (in shares)	0.0	8.6	10.3	8.6
Average price (in usd per share)	$ 0	$ 27.94	$ 23.83	$ 27.94
Amount	$ 0.0	$ 300.0	$ 200.0	$ 300.0