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Recently Issued Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 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 | $ 1,715.5 |  | $ 1,656.5 | $ 100.2
Long-term deferred tax liability | 815.4 |  | 221.5 | 205.8
Other assets | 110.1 |  | 47.7 | 71.8
Other long-term liabilities | $ 265.2 |  | $ 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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