Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income attributable to controlling interests	$ 32.6	$ 52.7
Less: Total income available to participating unvested securities	0.0	(0.1)
Total net income attributable to ordinary shares	$ 32.6	$ 52.6
Denominator:
Weighted average ordinary shares outstanding (in shares)	85,081,166	97,645,020
Potential shares of common stock:
Restricted stock units (in shares)	17,893	199,563
Weighted-average diluted ordinary shares outstanding - diluted (in shares)	85,099,059	97,844,583
Earnings per share of common stock attributable to controlling interests:
Basic (in dollars per share)	$ 0.38	$ 0.54
Diluted (in dollars per share)	$ 0.38	$ 0.54
Employee options not included in computation of diluted EPS (in shares)	9,330,000