Income Taxes	6 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Act. The Tax Act represents significant U.S. federal tax reform legislation that includes a permanent reduction to the U.S. federal corporate income tax rate. The permanent reduction to the federal corporate income tax rate resulted in a one-time gain of $267.0 million related to the value of our deferred tax liabilities and a gain of $3.2 million related to the lower blended tax rate on our earnings, in the year ended March 31, 2018, resulting in a net gain of $270.2 million. Additionally, the Tax Act subjects certain of our cumulative foreign earnings and profits to U.S. income taxes through a deemed repatriation, which resulted in a charge of $1.9 million in the year ended March 31, 2018. The changes included in the Tax Act are broad and complex. The final transition impacts of the Tax Act may differ from the above estimates, possibly materially, due to, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act, any changes in accounting standards for income taxes or related interpretations in response to the Tax Act, or any updates or changes to estimates we have utilized to calculate the transition impacts, including impacts from changes to current year earnings estimates and foreign exchange rates of foreign subsidiaries. The U.S. Securities and Exchange Commission ("SEC") has issued rules that allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. We currently anticipate finalizing and recording any resulting adjustment by the end of the measurement period. Income taxes are recorded in our quarterly financial statements based on our estimated annual effective income tax rate, subject to adjustments for discrete events, should they occur. The effective rates used in the calculation of income taxes were 29.1% and 37.7% for the three months ended September 30, 2018 and 2017, respectively. The effective rates used in the calculation of income taxes were 27.4% and 36.8% for the six months ended September 30, 2018 and 2017, respectively. The decreases in the effective tax rates for the three and six months ended September 30, 2018 versus the respective prior year periods were primarily related to the Tax Act. The balance in our uncertain tax liability was $10.8 million at September 30, 2018 and at March 31, 2018. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. We did not incur any material interest or penalties related to income taxes in any of the periods presented.

Income Taxes

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Act. The Tax Act represents significant U.S. federal tax reform legislation that includes a permanent reduction to the U.S. federal corporate income tax rate. The permanent reduction to the federal corporate income tax rate resulted in a one-time gain of $267.0 million related to the value of our deferred tax liabilities and a gain of $3.2 million related to the lower blended tax rate on our earnings, in the year ended March 31, 2018, resulting in a net gain of $270.2 million. Additionally, the Tax Act subjects certain of our cumulative foreign earnings and profits to U.S. income taxes through a deemed repatriation, which resulted in a charge of $1.9 million in the year ended March 31, 2018.

The changes included in the Tax Act are broad and complex. The final transition impacts of the Tax Act may differ from the above estimates, possibly materially, due to, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act, any changes in accounting standards for income taxes or related interpretations in response to the Tax Act, or any updates or changes to estimates we have utilized to calculate the transition impacts, including impacts from changes to current year earnings estimates and foreign exchange rates of foreign subsidiaries. The U.S. Securities and Exchange Commission ("SEC") has issued rules that allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. We currently anticipate finalizing and recording any resulting adjustment by the end of the measurement period.

Income taxes are recorded in our quarterly financial statements based on our estimated annual effective income tax rate, subject to adjustments for discrete events, should they occur. The effective rates used in the calculation of income taxes were 29.1% and 37.7% for the three months ended September 30, 2018 and 2017, respectively. The effective rates used in the calculation of income taxes were 27.4% and 36.8% for the six months ended September 30, 2018 and 2017, respectively. The decreases in the effective tax rates for the three and six months ended September 30, 2018 versus the respective prior year periods were primarily related to the Tax Act.

The balance in our uncertain tax liability was $10.8 million at September 30, 2018 and at March 31, 2018. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. We did not incur any material interest or penalties related to income taxes in any of the periods presented.