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Long-Term Debt (Narrative) (Details) € in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) | Dec. 28, 2018 USD ($) loan | Dec. 29, 2017 USD ($) | Dec. 30, 2016 USD ($) | Dec. 28, 2018 EUR (€) loan | Jun. 29, 2018 USD ($) | May 15, 2018 USD ($) | Nov. 24, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 2,976.4 | $ 786.0 | [1] | $ 355.0 | [1] |  |  |  |
Long-term Debt |  | 1,968.5 | 913.9 |  |  |  |  |  |  |
Repayments of Debt |  | 1,925.1 | 495.4 | [1] | 465.3 | [1] |  |  |  |
Payments to Acquire Businesses, Gross |  | 1,782.9 | 331.2 |  | $ 27.6 |  |  |  |  |
Promissory Notes And Other [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes Payable |  | 1.0 | 1.2 |  |  |  |  |  |  |
Notes Payable, Noncurrent |  | 0.7 | 0.8 |  |  |  |  |  |  |
Uncommitted Facilities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | 255.9 | 128.0 |  |  |  |  |  |  |
Uncommitted Facilities [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity |  | $ 75.0 |  |  |  |  |  |  |  |
Number Of Revolving Loan Facilities | loan |  | 2 |  |  |  |  | 2 |  |  |
Short-term Debt |  | $ 255.9 | $ 128.0 |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.16% | 2.24% |  |  |  | 2.16% |  |  |
Euro Uncommitted Facilities Three [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity | € |  |  |  |  |  |  | € 100.0 |  |  |
Two Thousand Eighteen Credit Facility [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | $ 425.0 |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Covenant Ratio - Minimum Interest Coverage |  | 3.50 |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Payable Periods On Borrowings |  | 3 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 0.50% |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 1.00% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Reserve Adjusted One Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 1 month |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Reserve Adjusted One Month LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 0.00% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Reserve Adjusted One Month LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 0.875% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted LIBOR Rate One Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 1 month |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted LIBOR Rate Two Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 2 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted LIBOR Rate Three Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 3 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted LIBOR Rate Six Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 6 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjustment LIBOR Rate One, Two, Three Or Six Month Interest Periods [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 1.00% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjustment LIBOR Rate One, Two, Three Or Six Month Interest Periods [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 1.875% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate One Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 1 month |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate Two Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 2 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate Three Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 3 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate Six Month Interest Period [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Maturity Period, Variable Rate |  | 6 months |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate, One, Two, Three Or Six Months Interest Periods [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 1.00% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | Adjusted EURIBOR Rate, One, Two, Three Or Six Months Interest Periods [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility interest margin on stated base rate |  | 1.875% |  |  |  |  |  |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | 2018 Credit Facility Maximum Leverage Ratio Permitted At End Of Third Quarter Fiscal 2018 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 3.50 |  |  |  |  | 3.50 |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | 2018 Credit Facility Maximum Leverage Ratio Permitted For the Four Fiscal Quarters Beginning Third Quarter of Fiscal 2018 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 4.25 |  |  |  |  | 4.25 |  |  |
Two Thousand Eighteen Credit Facility [Member] | Revolving Credit Facility [Member] | 2018 Credit Facility Leverage Ratio Permitted for Subsequent Two Fiscal Quarter or For Four Fiscal Quarters in connection with Material Acquisitions [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 3.75 |  |  |  |  | 3.75 |  |  |
Revolving Credit Facility, due May 2023 [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | $ 0.0 |  |  |  |  |  |  |  |
2014 Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  | 0.0 | $ 389.0 |  |  |  |  |  |  |
Two Thousand Twenty Three Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 300.0 | 0.0 |  |  |  |  | $ 300.0 |  |
Long-term Debt |  | $ 300.0 | 0.0 |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 4.15% |  |  |  |  | 4.15% | 4.15% |  |
Debt Issuance Costs, Gross |  | $ 0.9 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 99.964% |  |  |  |  |  |  |  |
Two Thousand Twenty Eight Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 600.0 | 0.0 |  |  |  |  | $ 600.0 |  |
Long-term Debt |  | $ 600.0 | 0.0 |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 4.90% |  |  |  |  | 4.90% | 4.90% |  |
Debt Issuance Costs, Gross |  | $ 1.8 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 99.867% |  |  |  |  |  |  |  |
Two Thousand Twenty Four Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400.0 | 400.0 |  |  |  |  |  |  | $ 400.0
Long-term Debt |  | $ 400.0 | $ 400.0 |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 4.75% |  |  |  |  | 4.75% |  |  | 4.75%
Debt Issuance Costs, Gross |  | $ 3.0 |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Two Thousand Eighteen Credit Facility [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  | $ 1,750.0 |
Debt Issuance Costs, Gross |  | 4.9 |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Two Thousand Eighteen Credit Facility [Member] | Unsecured Debt [Member] | Delayed Draw Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  | 500.0 |
JPMorgan Chase Bank, N.A. [Member] | Two Thousand Eighteen Credit Facility [Member] | Unsecured Debt [Member] | Additional Loan Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  | 500.0 |
JPMorgan Chase Bank, N.A. [Member] | Two Thousand Eighteen Credit Facility [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  | $ 1,250.0 |
Waterfall Holdings [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,211.3 | 1,211.3 |  |  |  |  |  |  |  |
Waterfall Holdings [Member] | Bridge Loan [Member] | Unsecured Bridge Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment, Interest |  | $ 5.8 |  |  |  |  |  |  |  |
[1] | See Note 2 for a summary of adjustments

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