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Effect of New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Right-of-use assets | $ 373.9 | $ 393.5 | $ 379.6
Operating lease liabilities | 409.7 |  | 420.3
Net rent related asset and liabilities |  |  | 38.3
Retained earnings | $ 2,371.7 | $ 1,901.3 |
ASU 2016-02 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2019 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | false |  |
ASU 2016-13 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
ASU 2018-13 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
ASU 2018-14 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
ASU 2017-12 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2019 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | false |  |
ASU 2017-04 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
ASU 2018-15 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |
Cumulative Effect Period Of Adoption Adjustment [Member] | ASU 2016-02 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings |  |  | (2.4)
Cumulative Effect Period Of Adoption Adjustment [Member] | ASU 2017-12 [Member] | Accumulated Other Comprehensive Loss [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Retained earnings |  |  | $ 0.2

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