Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax Credit Carryforward, Valuation Allowance			$ 874.0
Federal tax provision reclassified to foreign tax provision				$ 41.6	$ 57.3
Tax benefit due to tax planning strategies	$ 29.3	$ 18.7
Foreign net operating loss deferred tax asset not previously included		118.0		118.0
Foreign net operating loss valuation allowance not previously included		118.0		118.0
Deferred tax assets, net operating loss		899.9	2,033.0	899.9
Valuation allowance		2,090.1	3,296.0	2,090.1
Foreign tax credit carryforwards			815.8
Deferred tax liabilities, undistributed foreign earnings			87.0
Undistributed earnings of foreign subsidiaries			1,400.0
Net increase (decrease) in valuation allowance				669.7	441.0
Valuation Allowance, Amount Recorded to Income Statement					367.0
Increase (Decrease) In Deferred Tax Liability, Undistributed Earnings			2.2
Minimum tax credit carryforwards			35.9
Deferred Tax Assets, Tax Credit Carryforwards, Research			18.0
Total gross unrecognized tax benefits		53.0	58.7	53.0	56.7	$ 26.0
Unrecognized tax benefits that would impact effective tax rate			43.1
Accrued interest and penalties		$ 6.6	9.3	6.6
Expense for interest and penalties			2.5	2.8	0.9
Operating Loss Carryforwards, Valuation Allowance			1,994.1
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			1,935.3
State and Local Jurisdiction [Member]
Operating loss carryforwards			1,579.6
Operating Loss Carryforwards, Valuation Allowance			97.7
Deferred tax assets, state tax loss carryforwards			97.7
Foreign [Member]
Operating Loss Carryforwards, Valuation Allowance			1,896.4
Beginning [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound			$ 14.0
Beginning [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Expiration Dates			Jan. 01, 2017
Beginning [Member] | Foreign [Member]
Tax Credit Carryforward, Expiration Date			Jan. 01, 2018
Operating Loss Carryforwards, Expiration Dates			Jan. 01, 2017
Ending [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound			$ 30.0
Ending [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Expiration Dates			Dec. 31, 2036
Ending [Member] | Foreign [Member]
Tax Credit Carryforward, Expiration Date			Dec. 31, 2026
Operating Loss Carryforwards, Expiration Dates			Dec. 31, 2031
DOJ [Member] | FCPA [Member]
Litigation Settlement, Amount					$ 68.0
SEC [Member] | FCPA [Member]
Litigation Settlement, Amount				$ 67.0
Research Tax Credit Carryforward [Member] | Beginning [Member]
Tax Credit Carryforward, Expiration Date			Jan. 01, 2027
Research Tax Credit Carryforward [Member] | Ending [Member]
Tax Credit Carryforward, Expiration Date			Dec. 31, 2036
Investment Tax Credit Carryforward [Member]
Tax credit carryforward			$ 4.3
Investment Tax Credit Carryforward [Member] | Beginning [Member]
Tax Credit Carryforward, Expiration Date			Jan. 01, 2020
Investment Tax Credit Carryforward [Member] | Ending [Member]
Tax Credit Carryforward, Expiration Date			Dec. 31, 2031
Foreign [Member]
Operating loss carryforwards			$ 7,510.7
Operating loss carryforwards, not subject to expiration			7,118.3
Operating loss carryforwards, subject to expiration			$ 392.4