Restructuring Costs Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Pre-tax restructuring costs		$ 35.0	$ 23.6	$ 5.1
Accrued liability settlement term		19 years
Withdrawal from Multiemployer Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax restructuring costs	$ 12.5
2016 Restructuring Actions
Defined Benefit Plan Disclosure [Line Items]
Pre-tax restructuring costs		$ 31.8
2016 Restructuring Actions | Withdrawal from Multiemployer Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax restructuring costs		12.5
Electrical | 2016 Restructuring Actions | Withdrawal from Multiemployer Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax restructuring costs		$ 12.5