Property, Plant and Equipment-Net (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment-Net
Gross property plant and equipment	$ 7,004.6		$ 6,343.2
Less: Accumulated depreciation, depletion and amortization	2,399.5		2,241.5
Net property, plant and equipment	4,605.1		4,101.7
Amount of accrued and unpaid construction in progress	255.4		228.9
Land
Property, Plant and Equipment-Net
Gross property plant and equipment	48.9		37.9
Machinery and equipment
Property, Plant and Equipment-Net
Gross property plant and equipment	5,107.2		5,046.8
Changes in plant turnaround activity
Balance at the beginning of the period	119.8	82.1
Additions	18.8	35.8
Depreciation	(29.5)	(18.2)
Effect of exchange rate changes	(0.2)	(0.2)
Balance at the end of the period	108.9	99.5
Buildings and improvements
Property, Plant and Equipment-Net
Gross property plant and equipment	162.4		159.4
Construction in progress
Property, Plant and Equipment-Net
Gross property plant and equipment	1,686.1		1,099.1
Capacity expansion project
Property, Plant and Equipment-Net
Gross property plant and equipment	$ 1,200.0