Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2019
Equity [Abstract]
Stock repurchased and retired during period, shares	0.8	7.3
Common stock value acquired including acquisition costs	$ 8.3	$ 74.6
Average cost per share (in dollars per share)	$ 10.22	$ 10.16
Shares repurchased (in shares)		$ 34.2