Income Taxes, Reconciliation of Statutory to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective income tax rate, continuing operations, tax rate reconciliation [Abstract]
Income taxes at statutory rate	35.00%	35.00%	35.00%
Foreign tax rate differential	(1.98%)	0.92%	0.00%
Non-deductible expenses	0.11%	0.09%	0.12%
Controlled foreign corporation losses	(2.63%)	1.09%	1.48%
Section 987 implementation	2.69%	0.00%	0.00%
Other	(0.42%)	0.13%	0.03%
Effective income tax rate, continuing operations	32.77%	37.23%	36.63%
Undistributed earnings of foreign subsidiaries	$ 70.0	$ 70.0	$ 50.0
Deferred tax liability on undistributed foreign earnings	$ 7.6