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Summary of Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Millions | Dec. 29, 2019 | Dec. 28, 2019 | Dec. 29, 2018
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Summary Of Accounting Policies [Line Items] |  |  |
Retained earnings |  | $ 4,779.7 | $ 4,257.6
Scenario, Forecast | Accounting Standards Update 2016-13 [Member] |  |  |
Summary Of Accounting Policies [Line Items] |  |  |
Finance, contract, and trade receivables, allowance for credit loss | $ 8.0 |  |
Retained earnings | $ (8.0) |  |

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