Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Lease Termination Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Lease Termination Costs [Line Items]
Lease termination costs included in operating expenses	$ 8.4	$ 29.9	$ 38.3	$ 0	$ 0
Railroad Transportation Equipment [Member]
Lease Termination Costs [Line Items]
Property, plant and equipment additions			$ 300.7