Income Taxes (Details) ₨ in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2017
USD ($)
|
Jun. 30, 2018
INR (₨)
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2017
USD ($)
|
Mar. 31, 2018
USD ($)
|
|
| Income Tax Disclosure [Abstract] | ||||||
| Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Liability | $ 172.8 | $ 172.8 | ||||
| Tax assessment amount | ₨ 3,500.0 | 51.5 | ||||
| Penalty assessment | 2,100.0 | 31.2 | ||||
| Partial stay, penalty and interest expense | 543.4 | 7.9 | ||||
| Income tax expense (benefit) | 23.5 | $ 14.0 | 49.9 | $ 29.3 | ||
| Pretax Income | $ 132.8 | $ 105.5 | 265.8 | $ 205.1 | ||
| Unrecognized tax benefits | $ 71.2 | |||||
| Unrecognized tax benefits classified as long term liabilities | 68.0 | |||||
| Unrecognized tax benefits classified as reduction to deferred tax assets | $ (3.2) | |||||
| Deposits made for tax penalty | ₨ 100.0 | $ 1.5 | ||||