Equity Transactions Narrative (Details) - USD ($)	1 Months Ended
	May 31, 2019	Dec. 31, 2018	Sep. 30, 2017	Jun. 30, 2015	Dec. 31, 2019	Jun. 30, 2014
Accelerated Share Repurchases [Line Items]
Remaining authorized repurchase amount					$ 78,100,000
2014 Repurchase Program
Accelerated Share Repurchases [Line Items]
Share repurchase program authorized amount					$ 700,000,000.0	$ 300,000,000.0
Increase in share repurchase program authorized amount	$ 100,000,000	$ 100,000,000.0	$ 100,000,000.0	$ 100,000,000.0