Employee Benefits (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)	Jan. 01, 2017	Oct. 01, 2016 USD ($)
Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Employer Contribution	$ 8.8
Defined Benefit Plan, Expected Contributions in Current Fiscal Year	9.4
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Employer Contribution	1.6
Defined Benefit Plan, Expected Contributions in Current Fiscal Year	$ 1.7
Subsequent Event | Other Postretirement Benefit Plans
Defined Benefit Plan, Plan Amendment [Abstract]
Defined Benefit Plan, decrease in benefit obligation			$ 32.7
$1,000 or $2,250 deductible plan options | Scenario, Forecast | Maximum | Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Age Eligible for Benefit		65
Medicare advantage plan | Scenario, Forecast | Minimum | Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Age Eligible for Benefit		65