Fair Value - Inputs (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Series C preferred stock
Fair Value
Estimated fair value of Visa preferred shares	$ 32.8
eService | Weighted Average Cost of Capital
Fair Value
Redeemable non-controlling interest, measurement input (as a percent)	15.50%
eService | Minimum | Growth Rate
Fair Value
Redeemable non-controlling interest, measurement input (as a percent)	3.00%
eService | Maximum | Growth Rate
Fair Value
Redeemable non-controlling interest, measurement input (as a percent)	10.40%