Income Taxes Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Taxes [Abstract]
Effective Income Tax Rate, Continuing Operations	32.50%	51.30%	(21.60%)	43.60%
Federal Statutory Tax Rate			35.00%
Unrecognized Tax Benefits	$ 79.5		$ 79.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	7.9		7.9
Unrecognized Tax Benefits, Period Increase (Decrease)			143.0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			102.5
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities			$ 40.5
Payments for Other Taxes	$ 34.2