Fair Value - Other (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Series C preferred stock
Fair Value
Carrying amount of Visa preferred shares	$ 14.7	$ 14.7
Estimated fair value of Visa preferred shares	$ 32.5
eService | Weighted Average Cost of Capital
Fair Value
Redeemable non-controlling interest, measurement input (as a percent)	15.00%
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)	10.70%