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Significant Accounting Policies - Balance Sheet Adjustments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jun. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net | $ 880.6 |  | $ 903.8 | $ 563.7
Inventories | 711.7 |  | 471.1 | 476.2
Other current assets | 191.6 |  | 137.0 | 119.8
Long-term deferred tax assets | 1,677.2 |  | 1,656.5 | 100.2
Other assets | 111.8 |  | 47.7 | 71.8
Accrued liabilities | 787.3 |  | 633.8 | 229.6
Deferred income on shipments to distributors | 0.0 |  | 0.0 | 333.8
Long-term deferred tax liability | 706.1 |  | 221.5 | 205.8
Other long-term liabilities | 279.5 |  | 239.2 | 240.9
Accumulated other comprehensive loss | (20.7) |  | (19.3) | (17.6)
Retained earnings | $ 3,210.6 |  | $ 3,199.0 | 1,397.3
Accounting Standards Update 2014-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net |  |  |  | 340.1
Inventories |  |  |  | (5.1)
Other current assets |  |  |  | 17.2
Long-term deferred tax assets |  |  |  | (23.1)
Other assets |  |  |  | 0.0
Accrued liabilities |  |  |  | 404.2
Deferred income on shipments to distributors |  |  |  | (333.8)
Long-term deferred tax liability |  |  |  | 16.8
Other long-term liabilities |  |  |  | 0.0
Accumulated other comprehensive loss |  |  |  | 0.0
Retained earnings |  |  |  | 241.9
Accounting Standards Update 2016-01 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net |  |  |  | 0.0
Inventories |  |  |  | 0.0
Other current assets |  |  |  | 0.0
Long-term deferred tax assets |  |  |  | 0.0
Other assets |  |  |  | 0.0
Accrued liabilities |  |  |  | 0.0
Deferred income on shipments to distributors |  |  |  | 0.0
Long-term deferred tax liability |  |  |  | 0.0
Other long-term liabilities |  |  |  | 0.0
Accumulated other comprehensive loss |  |  |  | (1.7)
Retained earnings |  |  |  | 1.7
Accounting Standards Update 2016-16 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net |  |  |  | 0.0
Inventories |  |  |  | 0.0
Other current assets |  |  |  | 0.0
Long-term deferred tax assets |  | $ 1,580.0 |  | 1,579.4
Other assets |  | (24.1) |  | (24.1)
Accrued liabilities |  |  |  | 0.0
Deferred income on shipments to distributors |  |  |  | 0.0
Long-term deferred tax liability |  | (1.1) |  | (1.1)
Other long-term liabilities |  | $ (1.7) |  | (1.7)
Accumulated other comprehensive loss |  |  |  | 0.0
Retained earnings |  |  |  | $ 1,558.1

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