New Accounting Standards New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017	Apr. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Document Period End Date			Jun. 30, 2018
Deferred Revenue, Revenue Recognized	$ 18.9	$ 15.2	$ 93.5	$ 81.4
Accounts, Notes, Loans and Financing Receivable, Net, Current	2,151.4		2,151.4		$ 1,628.7
Revenue, Net	3,643.6	3,286.7	6,852.9	6,143.0
Cost of Goods and Services Sold	2,356.5	2,073.4	4,400.1	3,863.7
Selling, General and Administrative Expense	801.8	738.6	1,580.6	1,420.6
Provision for Doubtful Accounts	4.0	5.6	10.8	13.9
Other Noninterest Expense	119.3	55.3	177.3	155.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	294.4	358.3	546.2	831.7
Income Tax Expense (Benefit)	1.0	80.7	82.7	160.4
Net Income (Loss) Attributable to Parent	$ 293.6	$ 277.6	$ 464.2	$ 671.3
Earnings Per Share, Diluted	$ 1.93	$ 1.82	$ 3.03	$ 4.42
Other Assets, Noncurrent	$ 495.5		$ 495.5		512.7
Long-term Debt, Current Maturities	978.9		978.9		977.5
Accrued Liabilities, Current	1,270.0		1,270.0		1,387.7
Long-term Debt, Excluding Current Maturities	2,831.2		2,831.2		2,828.2
Deferred Tax Liabilities, Net, Noncurrent	467.0		467.0		436.1
Other Liabilities, Noncurrent	2,451.0		2,451.0		2,507.0
Retained Earnings (Accumulated Deficit)	6,273.9		6,273.9		5,998.7
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,772.4)	$ (1,725.6)	(1,772.4)	$ (1,725.6)	(1,589.1)		$ (1,921.6)
Increase (Decrease) in Operating Capital	(185.0)	(263.7)	(729.3)	(797.0)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(38.9)	21.2	(137.7)	14.4
Net Cash Provided by (Used in) Operating Activities	198.0	151.8	(151.4)	(162.3)
Supplemental Deferred Purchase Price	0.0	104.7	0.0	227.8	106.9
Net Cash Provided by (Used in) Investing Activities	(587.5)	(46.4)	(713.8)	(1,642.4)
Cash and Cash Equivalents, Period Increase (Decrease)	(19.8)	161.5	(251.7)	(637.7)
Cash and Cash Equivalents, at Carrying Value	$ 385.8	539.5	385.8	539.5	637.5	$ 378.0	1,177.2
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, Net		57.2		107.9
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, Net		0.0		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		3,229.5		6,035.1
Cost of Goods and Services Sold		2,017.3		3,757.6
Selling, General and Administrative Expense		733.9		1,410.4
Provision for Doubtful Accounts		4.8		13.0
Other Noninterest Expense		60.3		166.5
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		357.7		830.3
Income Tax Expense (Benefit)		80.5		160.0
Net Income (Loss) Attributable to Parent		$ 277.2		$ 670.3
Earnings Per Share, Diluted		$ 1.82		$ 4.41
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		$ (159.1)		$ (569.3)
Increase (Decrease) in Other Operating Assets and Liabilities, Net		21.7		60.9
Net Cash Provided by (Used in) Operating Activities		256.5		110.9
Supplemental Deferred Purchase Price		0.0	0.0
Net Cash Provided by (Used in) Investing Activities		(151.1)		(1,870.2)
Cash and Cash Equivalents, Period Increase (Decrease)		161.5		(592.3)
Cash and Cash Equivalents, at Carrying Value		539.5		539.5		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		55.8		105.6
Selling, General and Administrative Expense		0.0		0.0
Provision for Doubtful Accounts		0.8		0.9
Other Noninterest Expense		0.0		0.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0.6		1.4
Income Tax Expense (Benefit)		0.2		0.4
Net Income (Loss) Attributable to Parent		$ 0.4		$ 1.0
Earnings Per Share, Diluted		$ 0		$ 0.01
Increase (Decrease) in Operating Capital		$ 0.1		$ 0.1
Increase (Decrease) in Other Operating Assets and Liabilities, Net		(0.5)		(1.1)
Net Cash Provided by (Used in) Operating Activities		0.0		0.0
Supplemental Deferred Purchase Price		0.0	0.0
Net Cash Provided by (Used in) Investing Activities		0.0		0.0
Cash and Cash Equivalents, Period Increase (Decrease)		0.0		0.0
Cash and Cash Equivalents, at Carrying Value		0.0		0.0		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		0.3		0.5
Selling, General and Administrative Expense		4.7		10.2
Provision for Doubtful Accounts		0.0		0.0
Other Noninterest Expense		(5.0)		(10.7)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		0.0		0.0
Income Tax Expense (Benefit)		0.0		0.0
Net Income (Loss) Attributable to Parent		$ 0.0		$ 0.0
Earnings Per Share, Diluted		$ 0		$ 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		$ (104.7)		$ (227.8)
Increase (Decrease) in Other Operating Assets and Liabilities, Net		0.0		(45.4)
Net Cash Provided by (Used in) Operating Activities		(104.7)		(273.2)
Supplemental Deferred Purchase Price		104.7	$ 227.8
Net Cash Provided by (Used in) Investing Activities		104.7		227.8
Cash and Cash Equivalents, Period Increase (Decrease)		0.0		(45.4)
Cash and Cash Equivalents, at Carrying Value		$ 0.0		$ 0.0		$ 0.0	$ 45.4