New Accounting Standards New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts, Notes, Loans and Financing Receivable, Net, Current	$ 1,986.1		$ 1,628.7
Revenue, Net	3,209.3	$ 2,856.3
Cost of Goods and Services Sold	2,043.6	1,790.3
Selling, General and Administrative Expense	778.8	682.0
Provision for Doubtful Accounts	6.8	8.3
Other Noninterest Expense	58.0	100.5
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	251.8	473.4
Income Tax Expense (Benefit)	81.7	79.7
Net Income (Loss) Attributable to Parent	$ 170.6	$ 393.7
Earnings Per Share, Diluted	$ 1.11	$ 2.60
Other Assets, Noncurrent	$ 510.0		512.7
Long-term Debt, Current Maturities	978.2		977.5
Accrued Liabilities, Current	1,260.0		1,387.7
Long-term Debt, Excluding Current Maturities	2,827.6		2,828.2
Deferred Tax Liabilities, Net, Noncurrent	442.3		436.1
Other Liabilities, Noncurrent	2,534.5		2,507.0
Retained Earnings (Accumulated Deficit)	6,074.5		5,998.7
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,493.3)	$ (1,808.1)	(1,589.1)	$ (1,921.6)
Increase (Decrease) in Operating Capital	(544.3)	(533.3)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(98.8)	(6.8)
Net Cash Provided by (Used in) Operating Activities	(349.4)	(314.1)
Supplemental Deferred Purchase Price	0.0	123.1	106.9
Net Cash Provided by (Used in) Investing Activities	(126.3)	(1,596.0)
Cash and Cash Equivalents, Period Increase (Decrease)	(231.9)	(799.2)
Cash and Cash Equivalents, at Carrying Value	405.6	378.0	637.5	1,177.2
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, Net		50.7
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, Net		0.0
Scenario, Previously Reported [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts, Notes, Loans and Financing Receivable, Net, Current			1,635.9
Revenue, Net		2,805.6
Cost of Goods and Services Sold		1,740.3
Selling, General and Administrative Expense		676.5
Provision for Doubtful Accounts		8.2
Other Noninterest Expense		106.2
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		472.6
Income Tax Expense (Benefit)		79.5
Net Income (Loss) Attributable to Parent		$ 393.1
Earnings Per Share, Diluted		$ 2.59
Other Assets, Noncurrent			487.8
Long-term Debt, Current Maturities			983.4
Accrued Liabilities, Current			1,352.1
Long-term Debt, Excluding Current Maturities			2,843.0
Deferred Tax Liabilities, Net, Noncurrent			434.2
Other Liabilities, Noncurrent			2,511.1
Retained Earnings (Accumulated Deficit)			5,990.4
Accumulated Other Comprehensive Income (Loss), Net of Tax			(1,585.9)
Increase (Decrease) in Operating Capital		$ (410.2)
Increase (Decrease) in Other Operating Assets and Liabilities, Net		39.2
Net Cash Provided by (Used in) Operating Activities		(145.6)
Supplemental Deferred Purchase Price	0.0
Net Cash Provided by (Used in) Investing Activities		(1,719.1)
Cash and Cash Equivalents, Period Increase (Decrease)		(753.8)
Cash and Cash Equivalents, at Carrying Value		378.0		1,131.8
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Goods and Services Sold		49.8
Selling, General and Administrative Expense		0.0
Provision for Doubtful Accounts		0.1
Other Noninterest Expense		0.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0.8
Income Tax Expense (Benefit)		0.2
Net Income (Loss) Attributable to Parent		$ 0.6
Earnings Per Share, Diluted		$ 0.01
Increase (Decrease) in Operating Capital		$ 0.0
Increase (Decrease) in Other Operating Assets and Liabilities, Net		(0.6)
Net Cash Provided by (Used in) Operating Activities		0.0
Supplemental Deferred Purchase Price	0.0
Net Cash Provided by (Used in) Investing Activities		0.0
Cash and Cash Equivalents, Period Increase (Decrease)		0.0
Cash and Cash Equivalents, at Carrying Value		0.0		0.0
Restatement Adjustment [Member] | Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts, Notes, Loans and Financing Receivable, Net, Current			(7.2)
Cost of Goods and Services Sold		0.2
Selling, General and Administrative Expense		5.5
Provision for Doubtful Accounts		0.0
Other Noninterest Expense		(5.7)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0.0
Income Tax Expense (Benefit)		0.0
Net Income (Loss) Attributable to Parent		$ 0.0
Earnings Per Share, Diluted		$ 0
Other Assets, Noncurrent			24.9
Long-term Debt, Current Maturities			(5.9)
Accrued Liabilities, Current			35.6
Long-term Debt, Excluding Current Maturities			(14.8)
Deferred Tax Liabilities, Net, Noncurrent			1.9
Other Liabilities, Noncurrent			(4.1)
Retained Earnings (Accumulated Deficit)			8.3	4.3
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (3.2)
Increase (Decrease) in Operating Capital		$ (123.1)
Increase (Decrease) in Other Operating Assets and Liabilities, Net		(45.4)
Net Cash Provided by (Used in) Operating Activities		(168.5)
Supplemental Deferred Purchase Price	$ 123.1
Net Cash Provided by (Used in) Investing Activities		123.1
Cash and Cash Equivalents, Period Increase (Decrease)		(45.4)
Cash and Cash Equivalents, at Carrying Value		$ 0.0		$ 45.4