Income Taxes - Income Tax Reconciliation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes at U.S. statutory rate of 35%									$ 343.0	$ 304.3	$ 266.4
State taxes, net of federal benefit									2.6	2.3	2.2
U.S. tax on non-U.S. earnings									18.8	(2.8)	22.3
Affiliates' earnings									(16.2)	(15.6)	(15.0)
Foreign rate differential									(84.1)	(73.4)	(57.9)
Tax holidays									(23.6)	(15.6)	(27.0)
Withholding taxes									10.6	15.4	12.3
Impairments and write-offs											4.8
Tax credits									(3.9)	(6.9)	(2.3)
Reserve adjustments, settlements and claims									41.0	0.5	12.9
Valuation allowance adjustments									5.5	(1.4)	9.7
Other									(1.1)	11.5	10.2
Provision for income taxes	67.3	71.9	85.3	68.1	44.5	56.3	66.6	50.9	292.6	218.3	238.6
Tax benefit associated with restructuring	3.4	1.4	1.7	8.8					15.3	5.1	7.7
Tax benefit on intangible asset impairment	0.4				2.0
Tax benefit of project termination settlement								3.8
Tax benefit associated retirement obligations								2.1
Other tax adjustments						5.6		1.7		11.7	19.8
Tax benefit of research and development and international tax credit extensions								6.6		6.7
Other tax benefits	0.2	0.9				3.1			1.1	2.2
Reversal of certain state valuation allowances					4.4	2.5				8.0
Tax impact of other tax adjustments								4.9		5.2
Tax benefit (expense) associated with disposal activities and restructuring											2.0
Tax impact of loss on disposals											5.7
Settlement of certain tax audits											5.9
Impact of change in repatriation assertion											7.5
Change in enacted tax rate											4.7
Tax impact of writedown of tax accounts											$ 11.1