Income Taxes (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
U.S. federal statutory tax rate	21.00%	21.00%	35.00%
Operating Loss Carryforwards, Valuation Allowance	$ 0.8	$ 1.0
Accumulated net earning	744.7	586.1
Gross deferred tax assets	58.3	32.5
Gross deferred tax liabilities	156.2	111.3
Unrecognized Tax Benefits	1.3	$ 0.4	$ 0.4	$ 1.3
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.8
Accumulated net earning	$ 16.7