Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2009	Apr. 30, 2016
Income Tax Disclosure [Line Items]
Net increase from the reevaluation of uncertain tax positions arising in examinations			$ 0.0
Net decrease from the reevaluation of uncertain tax positions arising in examinations			$ 2.3
Income Tax Expense Benefit Estimated Tax Rate			38.70%	43.50%
Final settlement with tax authority								$ 3.7
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years			2007
Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years			2015
Scenario, Plan [Member]
Income Tax Disclosure [Line Items]
Foreign Earnings Repatriated			$ 59.0
Federal Ministry of Finance, Germany [Member]
Income Tax Disclosure [Line Items]
Payment to taxing authority to pursue litigation							$ 14.5
Recognized current and deferred tax benefits			$ 0.5
Adjustment of certain deferred tax assets	$ 0.6	$ 5.8			$ 6.4	$ 6.3