Property, Plant and Equipment, Net (Summary of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment, Net
Land	$ 305.5	$ 332.3
Buildings and leasehold improvements	1,903.9	1,940.7
Machinery, equipment and other	2,935.4	3,106.3
Assets under construction	2,597.9	2,568.2
Total property, plant and equipment at cost	7,742.7	7,947.5
Less: Accumulated depreciation	(1,282.6)	(1,312.1)
Property, plant and equipment, net	$ 6,460.1	$ 6,635.4