Employee Benefits (Weighted Average Assumptions - Net Periodic Benefit Cost) (Details) - Other Postretirement Benefit Plan - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2016		Sep. 30, 2016	[1]	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, One Percentage Point Change, Increase or Decrease						1.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Benefit Obligations		$ 11.2				$ 11.2
Defined Benefit Plan, Effect of One Percentage Point Decrease on Benefit Obligations		$ 9.0				9.0
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components						1.3
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components						$ 1.0
Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term return on plan assets						4.875%	[1]	5.20%	5.20%
Initial						7.00%	[1]	7.25%	7.50%
Ultimate						4.50%	[1]	4.50%	4.50%
Year ultimate reached		2026	[1]			2026	[1]	2026	2026
Subsequent Event
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected long-term return on plan assets	4.875%
Benefit Obligation | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate		3.75%	[1]	4.59%				4.10%	4.90%
Service cost | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate		4.03%	[1]	4.91%				4.10%	4.90%
Interest cost | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount Rate		3.15%	[1]	3.86%				4.10%	4.90%

[1] The actuarial assumptions are evaluated by the Company at each measurement date. The Other Post-retirement Benefits Plan was remeasured at October 1, 2016 due to a plan amendment.