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Earnings Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to controlling interests	$ 75.4	$ (13.1)	$ 74.9	$ 69.9	$ (61.5)	$ 54.9	$ (20.8)	$ 64.1	$ 207.1	$ 36.7	$ 38.8
Basic weighted average shares outstanding (in dollars per share)									239.0	240.4	238.1
Diluted weighted average shares outstanding (in dollars per share)									242.9	246.1	244.4
Net income per common share:
Basic net income per share (in dollars per share)	$ 0.32	$ (0.05)	$ 0.31	$ 0.29	$ (0.26)	$ 0.23	$ (0.09)	$ 0.27	$ 0.87	$ 0.15	$ 0.16
Diluted net income per share (in dollars per share)	$ 0.32	$ (0.05)	$ 0.31	$ 0.28	$ (0.26)	$ 0.22	$ (0.09)	$ 0.26	$ 0.85	$ 0.15	$ 0.16

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