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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