Employee Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Contribution to benefit plans		$ 12.4
Pension and other post retirement total non-cash settlement expense	$ 1.6		$ 98.0
Selling, General and Administrative Expenses
Defined Benefit Plan Disclosure [Line Items]
Pension and other post retirement total non-cash settlement expense	0.3		20.7
Income from Discontinued Operations, Net of Tax
Defined Benefit Plan Disclosure [Line Items]
Pension and other post retirement total non-cash settlement expense	1.3		77.3
Pension and Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement expected contributions in current year		$ 17.0
Other Postretirement Benefit Obligation
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	19.7		19.7
Other Postretirement Benefit Obligation | Selling, General and Administrative Expenses
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	3.3		3.3
Other Postretirement Benefit Obligation | Cost of Sales
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 16.4		$ 16.4