Income Taxes Other Tax Disclosure (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		$ 0.0	$ 10.5	$ 6.1
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities				4.7
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		(3.5)	8.1	(6.1)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		6.9	12.2	$ 4.1	$ 10.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		48.5
Lower range of expected tax payment for settlement of transfer pricing audits		30.0
Upper range of expected payment for settlement of transfer pricing audits		40.0
Settlement with Taxing Authority [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 22.9
Tax positions relating to transfer pricing [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		$ 11.5	$ 23.1