Income Taxes, Net Operating Losses (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, tax benefit	$ 15.1
Net operating losses, valuation allowance	$ (2.0)
U.S. Federal [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2035
U.S. Federal [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2037
Non U.S. [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, tax benefit	$ 2.7
Net operating losses one, tax benefit	8.1
Net operating losses, valuation allowance	(0.8)
Net operating losses one, valuation allowance	$ (7.7)
Non U.S. [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2018
Non U.S. [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2037
U.S. State and Local [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, tax benefit	$ 5.4
Net operating losses, valuation allowance	$ 0.0
U.S. State and Local [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2034
U.S. State and Local [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating losses, expiration date	Dec. 31, 2037