Income Taxes, Tax Credit Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Tax Credit Carryforward [Abstract]
Alternative minimum tax credit	$ 0.1
Tax credit, expiration date	Dec. 31, 2026
Other deferred tax assets, tax benefit	$ 6.0
Other deferred tax assets, valuation allowance	(3.2)
Total tax carryforwards, tax benefit	79.0
Total tax carryforwards, valuation allowance	(72.5)
U.S. Federal [Member]
Tax Credit Carryforward [Abstract]
Tax credit, tax benefit	53.3
Tax credit, valuation allowance	$ (53.3)
U.S. Federal [Member] | Minimum [Member]
Tax Credit Carryforward [Abstract]
Tax credit, expiration date	Dec. 31, 2023
U.S. Federal [Member] | Maximum [Member]
Tax Credit Carryforward [Abstract]
Tax credit, expiration date	Dec. 31, 2037
U.S. State and Local [Member]
Tax Credit Carryforward [Abstract]
Tax credit, tax benefit	$ 0.4
Tax credit, valuation allowance	$ (0.1)
U.S. State and Local [Member] | Minimum [Member]
Tax Credit Carryforward [Abstract]
Tax credit, expiration date	Dec. 31, 2018
U.S. State and Local [Member] | Maximum [Member]
Tax Credit Carryforward [Abstract]
Tax credit, expiration date	Dec. 31, 2037
Non U.S. [Member]
Tax Credit Carryforward [Abstract]
Tax credit, tax benefit	$ 0.5
Tax credit, valuation allowance	(0.4)
Capital Losses [Member] | U.S. Federal [Member]
Tax Credit Carryforward [Abstract]
Tax credit, tax benefit	6.8
Tax credit, valuation allowance	$ (6.8)
Tax credit, expiration date	Dec. 31, 2021