Business Combination Transactions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 16, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 5,598.3	$ 7,607.6	$ 8,929.8		$ 3,718.3
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