Employee Retirement Plans and Postretirement Benefits Projected Benefit Obligation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 29, 2012
Change in benefit obligation:
Prior year benefit obligation	$ 3,979.0	$ 4,141.9
Service cost, net of expected employee contributions	15.1	18.1
Interest cost	174.7	164.2
Actual employee contributions	0.7	1.1
Actuarial loss (gain)	489.8	(100.3)
Plan amendment	0	0.4
Benefits paid	(216.2)	(209.5)
Adjustment due to change in historical accounting	0	8.1
Foreign currency exchange rate change	(301.6)	(45.0)
Benefit obligation at end of year	4,141.5	3,979.0
Change in plan assets:
Prior year fair value of assets	3,596.2	3,353.8
Actual return on plan assets	516.5	359.7
Employer contributions	41.2	121.6
Actual employee contributions	0.7	1.1
Benefits and plan expenses paid	(219.5)	(213.0)
Foreign currency exchange rate change	(267.5)	(27.0)
Fair value of plan assets at end of year	3,667.6	3,596.2
Funded status:	(473.9)	(382.8)
Amounts recognized in the Consolidated Balance Sheets:
Other non-current assets	79.1	91.8
Accounts payable and other current liabilities	(10.1)	(12.0)
Pension and postretirement benefits	(542.9)	(462.6)
Net amounts recognized	(473.9)	(382.8)
Funded status:
Projected benefit obligation	(4,141.5)	(3,979.0)
Fair value of plan assets	3,667.6	3,596.2
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	917.6	789.4
Net prior service cost	1.9	(0.8)
Total not yet recognized	919.5	788.6	1,121.0
Accumulated benefit and projected benefit obligations in excess of plan assets
Change in benefit obligation:
Benefit obligation at end of year	3,435.6	3,277.6
Change in plan assets:
Fair value of plan assets at end of year	2,882.6	2,803.0
Amounts recognized in the Consolidated Balance Sheets:
Accumulated benefit obligation	3,435.1	3,267.8
Funded status:
Accumulated benefit obligation	3,435.1	3,267.8
Projected benefit obligation	(3,435.6)	(3,277.6)
Fair value of plan assets	2,882.6	2,803.0
Pension
Change in benefit obligation:
Prior year benefit obligation	3,816.9	3,955.5
Service cost, net of expected employee contributions	12.1	14.7
Interest cost	167.6	157.0
Actual employee contributions	0.7	1.1
Actuarial loss (gain)	477.2	(84.6)
Plan amendment	0	0.5
Benefits paid	(208.4)	(201.0)
Adjustment due to change in historical accounting	0	8.1
Foreign currency exchange rate change	(286.8)	(34.4)
Benefit obligation at end of year	3,979.3	3,816.9
Change in plan assets:
Prior year fair value of assets	3,596.2	3,353.8
Actual return on plan assets	516.5	359.7
Employer contributions	33.6	113.1
Actual employee contributions	0.7	1.1
Benefits and plan expenses paid	(211.9)	(204.5)
Foreign currency exchange rate change	(267.5)	(27.0)
Fair value of plan assets at end of year	3,667.6	3,596.2
Funded status:	(311.7)	(220.7)
Amounts recognized in the Consolidated Balance Sheets:
Other non-current assets	79.1	91.8
Accounts payable and other current liabilities	(2.8)	(3.1)
Pension and postretirement benefits	(388.0)	(309.4)
Net amounts recognized	(311.7)	(220.7)
Accumulated benefit obligation	3,978.5	3,805.9
Improvement in net underfunded status of aggregate pension and OPEB plans	(91.1)
Amount actual return on plan assets exceeded expected return	320
Funded status:
Accumulated benefit obligation	3,978.5	3,805.9
Projected benefit obligation	(3,979.3)	(3,816.9)
Fair value of plan assets	3,667.6	3,596.2
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	924.6	811.1
Net prior service cost	2.4	3.1
Total not yet recognized	927.0	814.2	1,134.3
Pension | Accumulated benefit and projected benefit obligations in excess of plan assets
Change in benefit obligation:
Benefit obligation at end of year	3,273.4	3,115.5
Change in plan assets:
Fair value of plan assets at end of year	2,882.6	2,803.0
Amounts recognized in the Consolidated Balance Sheets:
Accumulated benefit obligation	3,272.9	3,105.7
Funded status:
Accumulated benefit obligation	3,272.9	3,105.7
Projected benefit obligation	(3,273.4)	(3,115.5)
Fair value of plan assets	2,882.6	2,803.0
OPEB
Change in benefit obligation:
Prior year benefit obligation	162.1	186.4
Service cost, net of expected employee contributions	3.0	3.4
Interest cost	7.1	7.2
Actual employee contributions	0	0
Actuarial loss (gain)	12.6	(15.7)
Plan amendment	0	(0.1)
Benefits paid	(7.8)	(8.5)
Adjustment due to change in historical accounting	0	0
Foreign currency exchange rate change	(14.8)	(10.6)
Benefit obligation at end of year	162.2	162.1
Change in plan assets:
Prior year fair value of assets	0	0
Actual return on plan assets	0	0
Employer contributions	7.6	8.5
Actual employee contributions	0	0
Benefits and plan expenses paid	(7.6)	(8.5)
Foreign currency exchange rate change	0	0
Fair value of plan assets at end of year	0	0
Funded status:	(162.2)	(162.1)
Amounts recognized in the Consolidated Balance Sheets:
Other non-current assets	0	0
Accounts payable and other current liabilities	(7.3)	(8.9)
Pension and postretirement benefits	(154.9)	(153.2)
Net amounts recognized	(162.2)	(162.1)
Funded status:
Projected benefit obligation	(162.2)	(162.1)
Fair value of plan assets	0	0
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	(7.0)	(21.7)
Net prior service cost	(0.5)	(3.9)
Total not yet recognized	(7.5)	(25.6)	(13.3)
OPEB | Accumulated benefit and projected benefit obligations in excess of plan assets
Change in benefit obligation:
Benefit obligation at end of year	162.2	162.1
Change in plan assets:
Fair value of plan assets at end of year	0	0
Amounts recognized in the Consolidated Balance Sheets:
Accumulated benefit obligation	162.2	162.1
Funded status:
Accumulated benefit obligation	162.2	162.1
Projected benefit obligation	(162.2)	(162.1)
Fair value of plan assets	$ 0	$ 0