CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Current assets:
Cash and cash equivalents	$ 1,068,800,000	$ 1,068,800,000	$ 1,472,700,000
Accounts Receivable, after Allowance for Credit Loss, Current	2,216,400,000	2,216,400,000	2,261,500,000
Unbilled Contracts Receivable	827,400,000	827,400,000	716,800,000
Supplies inventories	436,300,000	436,300,000	401,400,000
Prepaid expenses and other	481,900,000	481,900,000	478,100,000
Total current assets	5,030,800,000	5,030,800,000	5,330,500,000
Property, plant and equipment, net	2,870,200,000	2,870,200,000	2,815,400,000
Goodwill, net	8,114,000,000	8,114,000,000	7,958,900,000
Intangible Assets, Net (Excluding Goodwill)	3,864,900,000	3,864,900,000	3,735,500,000
Joint venture partnerships and equity method investments	57,700,000	57,700,000	60,900,000
Deferred Income Taxes and Other Assets, Current	28,700,000	28,700,000	21,600,000
Other assets, net	436,800,000	436,800,000	462,600,000
Total assets	20,403,100,000	20,403,100,000	20,385,400,000
Liabilities, Current [Abstract]
Accounts Payable, Current	754,700,000	754,700,000	621,300,000
Accrued Liabilities, Current	1,139,800,000	1,139,800,000	1,404,100,000
Deferred Revenue, Current	544,200,000	544,200,000	558,500,000
Operating Lease, Liability, Current	192,100,000	192,100,000	187,000,000.0
Finance Lease, Liability, Current	10,500,000	10,500,000	10,500,000
Current debt excluding finance lease liability	1,600,000	1,600,000	1,500,000
Long-term debt, less current portion	2,642,900,000	2,642,900,000	2,782,900,000
Long-term Debt, Excluding Current Maturities	5,360,300,000	5,360,300,000	5,416,500,000
Commitments and contingent liabilities	484,500,000	484,500,000	402,000,000.0
Operating Lease, Liability, Noncurrent	669,400,000	669,400,000	642,500,000
Finance Lease, Liability, Noncurrent	81,900,000	81,900,000	84,600,000
Deferred income taxes and other tax liabilities	743,400,000	743,400,000	762,900,000
Noncontrolling interest	9,982,400,000	9,982,400,000	10,091,400,000
Shareholders' equity:
Common stock, 92.8 and 93.5 shares outstanding at March 31, 2013 and December 31, 2012, respectively	20,000,000.0	20,000,000.0	20,600,000
Additional paid-in capital	0	0	0
Retained earnings	8,300,000	8,300,000	8,500,000
Accumulated other comprehensive income	(10,897,900,000)	(10,897,900,000)	(10,456,800,000)
Total liabilities and shareholders' equity	(505,500,000)	(505,500,000)	(191,900,000)
Stockholders' Equity Attributable to Parent	10,400,700,000	10,400,700,000	10,273,400,000
Liabilities and Equity	20,403,100,000	20,403,100,000	$ 20,385,400,000
Net earnings	$ 358,900,000	$ 851,000,000.0