Business Combination Transactions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 16, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 7,607.6	$ 8,929.8		$ 3,718.3	$ 3,786.5
FMCTI Merger
Business Acquisition [Line Items]
Cash			$ 1,479.2
Accounts receivable			647.8
Costs and estimated earnings in excess of billings on uncompleted contracts			599.6
Inventory			764.8
Income taxes receivable			139.2
Other current assets			282.2
Property, plant and equipment			1,293.3
Intangible assets			1,390.3
Other long-term assets			167.3
Total identifiable assets acquired			6,763.7
Short-term and current portion of long-term debt			319.5
Accounts payable, trade			386.0
Billings in excess of costs and estimated earnings on uncompleted contracts			454.0
Income taxes payable			92.1
Other current liabilities			524.3
Long-term debt, less current portion			1,444.2
Accrued pension and other post-retirement benefits, less current portion			195.5
Deferred income taxes			219.4
Other long-term liabilities			138.7
Total liabilities assumed			3,773.7
Net identifiable assets acquired			2,990.0
Goodwill			5,180.7
Net assets acquired			$ 8,170.7