Commitments, Contingencies and Litigation Judgment (Details) - TMK IPSCO - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2016	Sep. 30, 2013	May 31, 2013	Sep. 30, 2016
Loss Contingencies [Line Items]
Direct damages sought			$ 10.0
Damages awarded	$ 2.2	$ 5.2
Additional damages sought		$ 3.8
Loss contingency accrual				$ 7.4