Postretirement Benefits Other Than Pensions (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) employees	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Income (Loss) from Continuing Operations before Income Taxes	$ 40.6	$ (33.2)	$ 2.6	$ (6.5)	$ (1.6)	$ 49.8	$ 34.3	$ 17.8	$ 3.5	$ 100.3	$ 160.2
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of retired employees covered | employees									500
Number of active employees covered | employees									225
Plan Amendments									$ (11.0)	0.0
Effect of one percentage point increase on accumulated postretirement benefit obligation									0.6	1.5
Effect of one percentage point increase on service and interest cost components										$ 0.1
Amounts that will be amortized from AOCI in next Fiscal Year									3.1
Estimated future employer contributions in next fiscal year									$ 1.8
Medical Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year									6.75%	7.00%
Health care cost trend rate assumed for future years									5.00%	5.00%
Prescription Drug Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next fiscal year									10.25%	11.00%
Health care cost trend rate assumed for future years									5.00%	5.00%