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Income Taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Provision for income taxes | $ 31,359,000 | $ 2,695,000 | $ 66,314,000 | $ 7,899,000 | $ 14,858,000 | $ 5,247,000 | $ 46,217,000 | $ 71,561,000
Discrete tax expense (benefit) | 100,000 |  | 42,100,000 |  |  |  | (1,100,000) | 44,300,000
Discrete tax expense (benefit) related to reassessments of prior year tax liabilities and income taxes recorded on a discrete basis in various jurisdictions | 13,500,000 |  | 17,800,000 |  |  |  | 12,300,000 | 20,400,000
Discrete tax benefit related to reassessment of future realizability of certain foreign deferred tax assets | 13,400,000 |  |  |  |  |  | 13,400,000 |
Discrete tax expense related to provisional tax for deemed repatriation of accumulated foreign earnings |  |  | 9,300,000 |  |  |  |  | 9,300,000
Discrete tax expense related to indefinite reinvestment assertion |  |  | 14,600,000 |  |  |  |  | 14,600,000
Tax benefit for U.S. losses | 0 |  | $ 0 |  |  |  | 0 | $ 0
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months | $ 8,000,000 |  |  |  |  |  | $ 8,000,000 |

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