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Schedule of New Accounting Pronouncements and Changes In Accounting Principles (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other assets | $ 94.2 | $ 64.3 | $ 59.1 | $ 33.6
Deferred tax asset, net | 55.3 | 84.7 | 113.0 | 119.4
Retained earnings | $ 9,868.7 | $ 9,043.0 | 8,222.1 | $ 8,203.0
Accounting Standards Update 2014-09 | Adjustments Due to Topic 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other assets |  |  | 25.5 |
Deferred tax asset, net |  |  | (6.4) |
Retained earnings |  |  | $ 19.1 |

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