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Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, Plant, and Equipment
Total property, plant and equipment, gross	$ 4,020.2		$ 4,002.8
Less: Accumulated depreciation	1,482.6		1,431.0
Total property, plant and equipment, net	2,537.6		2,571.8
Capitalized interest	0.5	$ 0.3
Original carrying value of assets under capital lease obligations	24.8		24.8
Land and improvements
Property, Plant, and Equipment
Total property, plant and equipment, gross	47.4		47.4
Buildings
Property, Plant, and Equipment
Total property, plant and equipment, gross	83.9		83.3
Machinery and equipment
Property, Plant, and Equipment
Total property, plant and equipment, gross	3,741.4		3,733.8
Automotive equipment
Property, Plant, and Equipment
Total property, plant and equipment, gross	24.8		24.7
Furniture and fixtures
Property, Plant, and Equipment
Total property, plant and equipment, gross	33.0		32.4
Leasehold improvements
Property, Plant, and Equipment
Total property, plant and equipment, gross	4.6		4.6
Aircraft
Property, Plant, and Equipment
Total property, plant and equipment, gross	3.6		3.6
Railcars
Property, Plant, and Equipment
Total property, plant and equipment, gross	16.8		16.8
Construction in progress
Property, Plant, and Equipment
Total property, plant and equipment, gross	$ 64.7		$ 56.2

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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