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Summary of Accounting Policies - Summary of the Effects of the Adoption of ASU No. 2017-07 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net sales | $ 980.1 | $ 982.8 | $ 3,035.2 | $ 2,945.8 |  |
Operating earnings | 232.4 | 208.7 | 717.9 | 669.7 | $ 882.1 | $ 861.1
Interest expense | (12.4) | (13.1) | (38.0) | (38.8) | (52.4) | (52.2)
Other income (expense) – net | (1.0) | (1.7) | 1.2 | (6.0) | (7.8) | (7.5)
Earnings before income taxes and equity earnings | 219.0 | 193.9 | 681.1 | 624.9 | 821.9 | 801.4
As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating earnings |  | 209.1 |  | 669.4 | 881.5 | 854.2
Interest expense |  | (13.1) |  | (38.8) | (52.4) | (52.2)
Other income (expense) – net |  | (2.1) |  | (5.7) | (7.2) | (0.6)
Earnings before income taxes and equity earnings |  | 193.9 |  | 624.9 | 821.9 | 801.4
Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating earnings |  | (0.4) |  | 0.3 | 0.6 | 6.9
Interest expense |  | 0.0 |  | 0.0 | 0.0 | 0.0
Other income (expense) – net |  | 0.4 |  | (0.3) | (0.6) | (6.9)
Earnings before income taxes and equity earnings |  | 0.0 |  | 0.0 | 0.0 | 0.0
Product And Services, Excluding Financial Services |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net sales | 898.1 | 903.8 | 2,788.2 | 2,712.3 | 3,686.9 | 3,430.4
Cost of goods sold | (444.2) | (455.0) | (1,375.6) | (1,352.0) | (1,861.0) | (1,720.0)
Gross profit | 453.9 | 448.8 | 1,412.6 | 1,360.3 | 1,825.9 | 1,710.4
Operating expenses | (280.8) | (296.1) | (868.7) | (853.7) | (1,161.3) | (1,048.0)
Operating earnings | $ 173.1 | 152.7 | $ 543.9 | 506.6 | 664.6 | 662.4
Product And Services, Excluding Financial Services | As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net sales |  | 903.8 |  | 2,712.3 | 3,686.9 | 3,430.4
Cost of goods sold |  | (455.2) |  | (1,352.7) | (1,862.0) | (1,720.8)
Gross profit |  | 448.6 |  | 1,359.6 | 1,824.9 | 1,709.6
Operating expenses |  | (295.5) |  | (853.3) | (1,160.9) | (1,054.1)
Operating earnings |  | 153.1 |  | 506.3 | 664.0 | 655.5
Product And Services, Excluding Financial Services | Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net sales |  | 0.0 |  | 0.0 | 0.0 | 0.0
Cost of goods sold |  | 0.2 |  | 0.7 | 1.0 | 0.8
Gross profit |  | 0.2 |  | 0.7 | 1.0 | 0.8
Operating expenses |  | (0.6) |  | (0.4) | (0.4) | 6.1
Operating earnings |  | (0.4) |  | 0.3 | 0.6 | 6.9
Financial Services |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating earnings |  | 56.0 |  | 163.1 | 217.5 | 198.7
Financial Services | As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating earnings |  | 56.0 |  | 163.1 | 217.5 | 198.7
Financial Services | Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating earnings |  | $ 0.0 |  | $ 0.0 | $ 0.0 | $ 0.0

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