Income Taxes Unrecognized Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Beginning Of Year	$ 101.4	$ 103.8
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	63.1	3.5
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(19.4)	(11.1)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	21.5	10.1
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	(2.6)	(1.8)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(1.1)	(3.1)
Unrecognized Tax Benefits, End Of Year	162.9	101.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	155.4	94.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6.3	5.4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(0.1)	$ (4.8)
Unrecognized tax benefits, acquisitions	$ 61.9