Subsequent Events (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event [Line Items]
Net income attributable to controlling interests		$ 18.9	$ 28.0	$ 51.5	$ 80.7
Subsidiaries
Subsequent Event [Line Items]
Net income attributable to controlling interests				$ 17.5
Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of interest in subsidiary	$ 319.0