Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes at U.S. statutory rate of 35%									$ 324.4	$ 343.0	$ 304.3
State taxes, net of federal benefit									8.2	2.6	2.3
U.S. tax on non-U.S. earnings									31.5	18.8	(2.8)
Affiliates' earnings									(14.0)	(16.2)	(15.6)
Foreign rate differential									(92.6)	(84.1)	(73.4)
Tax holidays									(21.2)	(23.6)	(15.6)
Withholding taxes									7.8	10.6	15.4
Tax credits									(3.2)	(3.9)	(6.9)
Reserve adjustments, settlements and claims									19.4	41.0	0.5
Valuation allowance adjustments									8.3	5.5	(1.4)
Other									11.8	(1.1)	11.5
Provision for income taxes	$ 61.2	$ 66.9	$ 80.2	$ 72.1	$ 67.3	$ 71.9	$ 85.3	$ 68.1	280.4	292.6	218.3
Tax benefit associated with restructuring	0.4	0.7	2.2	1.2	3.4	1.4	$ 1.7	$ 8.8	3.7	15.3	5.1
Tax benefit on intangible asset impairment										0.4	2.0
Tax benefit of project termination settlement											3.8
Tax impact of other tax settlements			3.9
Tax benefit associated with merger and acquisition expense	3.8
Tax benefit associated retirement obligations											2.1
Other tax adjustments											11.7
Tax benefit of research and development and international tax credit extensions											6.7
Other tax benefits	9.0				$ 0.2	$ 0.9				$ 1.1	2.2
Reversal of certain state valuation allowances											8.0
Tax impact of other tax adjustments	$ 7.7	$ 0.4	$ 1.3	$ 2.4					$ 9.9		$ 5.2