Commitments and Contingencies (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) claims LegalMatter	Dec. 31, 2016 claims	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Number of pending claims (legal matter) | claims	592	605
Asbestos forecast claim period	10 years	10 years
Connecticut Voluntary Corrective Action Program
Loss Contingencies [Line Items]
Estimated total cleanup costs, accrual	$ 1.9		$ 3.2
Loss contingency accrual, period decrease	(0.9)
Superfund Sites Proceedings
Loss Contingencies [Line Items]
Estimated total cleanup costs, accrual	$ 0.4
Number of pending claims (legal matter) | LegalMatter	1
Estimated total cleanup costs, cost sharing percentage (percent)	2.00%
PCB Contamination Proceedings
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 0.2
Minimum | Superfund Sites Proceedings
Loss Contingencies [Line Items]
Loss contingency, maximum possible loss	18.8
Maximum | Superfund Sites Proceedings
Loss Contingencies [Line Items]
Loss contingency, maximum possible loss	$ 29.6