Commitments and Contingencies (Details)	Mar. 31, 2017 USD ($)
Minimum
Commitments and contingencies
Possible losses in excess of any amounts accrued	$ 0
Minimum | Patent infringement
Commitments and contingencies
Possible losses in excess of any amounts accrued	0
Minimum | Merchant customer matters
Commitments and contingencies
Possible losses in excess of any amounts accrued	0
Minimum | Other matters
Commitments and contingencies
Possible losses in excess of any amounts accrued	0
Maximum
Commitments and contingencies
Possible losses in excess of any amounts accrued	110,000,000
Maximum | Patent infringement
Commitments and contingencies
Possible losses in excess of any amounts accrued	5,000,000
Maximum | Merchant customer matters
Commitments and contingencies
Possible losses in excess of any amounts accrued	100,000,000
Maximum | Other matters
Commitments and contingencies
Possible losses in excess of any amounts accrued	$ 5,000,000