CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Current assets:
Cash and cash equivalents	$ 409,900,000	$ 409,900,000	$ 1,472,700,000
Accounts Receivable, after Allowance for Credit Loss, Current	2,164,200,000	2,164,200,000	2,261,500,000
Unbilled Contracts Receivable	818,500,000	818,500,000	716,800,000
Supplies inventories	467,700,000	467,700,000	401,400,000
Prepaid expenses and other	511,500,000	511,500,000	478,100,000
Total current assets	4,371,800,000	4,371,800,000	5,330,500,000
Property, plant and equipment, net	2,884,700,000	2,884,700,000	2,815,400,000
Goodwill, net	8,217,600,000	8,217,600,000	7,958,900,000
Intangible Assets, Net (Excluding Goodwill)	3,807,800,000	3,807,800,000	3,735,500,000
Joint venture partnerships and equity method investments	63,700,000	63,700,000	60,900,000
Deferred Income Taxes and Other Assets, Current	29,400,000	29,400,000	21,600,000
Other assets, net	451,000,000.0	451,000,000.0	462,600,000
Total assets	19,826,000,000	19,826,000,000	20,385,400,000
Liabilities, Current [Abstract]
Accounts Payable, Current	765,500,000	765,500,000	621,300,000
Accrued Liabilities, Current	1,040,800,000	1,040,800,000	1,404,100,000
Deferred Revenue, Current	530,900,000	530,900,000	558,500,000
Operating Lease, Liability, Current	178,100,000	178,100,000	187,000,000.0
Finance Lease, Liability, Current	5,300,000	5,300,000	10,500,000
Current debt excluding finance lease liability	1,700,000	1,700,000	1,500,000
Long-term debt, less current portion	2,522,300,000	2,522,300,000	2,782,900,000
Long-term Debt, Excluding Current Maturities	5,334,300,000	5,334,300,000	5,416,500,000
Commitments and contingent liabilities	433,900,000	433,900,000	402,000,000.0
Operating Lease, Liability, Noncurrent	665,900,000	665,900,000	642,500,000
Finance Lease, Liability, Noncurrent	85,800,000	85,800,000	84,600,000
Deferred income taxes and other tax liabilities	672,700,000	672,700,000	762,900,000
Noncontrolling interest	9,714,900,000	9,714,900,000	10,091,400,000
Shareholders' equity:
Common stock, 92.8 and 93.5 shares outstanding at March 31, 2013 and December 31, 2012, respectively	18,900,000	18,900,000	20,600,000
Additional paid-in capital	0	0	0
Retained earnings	8,200,000	8,200,000	8,500,000
Accumulated other comprehensive income	(10,845,000,000)	(10,845,000,000)	(10,456,800,000)
Total liabilities and shareholders' equity	(761,000,000.0)	(761,000,000.0)	(191,900,000)
Stockholders' Equity Attributable to Parent	10,092,200,000	10,092,200,000	10,273,400,000
Liabilities and Equity	19,826,000,000	19,826,000,000	$ 20,385,400,000
Net earnings	$ 353,200,000	$ 1,204,200,000