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Shareholders' Equity - Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Net earnings attributable to noncontrolling interests $ 1.3 $ 1.3 $ 3.5 $ 5.7