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Recently Issued Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jun. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Long-term deferred tax assets | $ 1,717.1 |  | $ 1,656.5 | $ 100.2
Long-term deferred tax liability | (830.5) |  | (221.5) | (205.8)
Other assets | (106.4) |  | (47.7) | (71.8)
Other long-term liabilities | $ (257.4) |  | $ (239.2) | (240.9)
Accounting Standards Update 2016-16 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Long-term deferred tax assets |  | $ 1,580.0 |  | 1,579.4
Long-term deferred tax liability |  | 1.1 |  | 1.1
Other assets |  | 24.1 |  | 24.1
Other long-term liabilities |  | $ 1.7 |  | $ 1.7

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