CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Proceeds from bridge loan	$ 0.0	$ 0.0	$ 400.0
Repayments of Senior Debt	(500.1)	(454.7)	(500.0)
Payments on bridge loan	0.0	0.0	(400.0)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	1,274.0	733.2	438.7
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	533.2	499.2	457.8
Stock compensation	109.7	109.6	102.1
(Gain) loss on sale of assets	1.5	(9.2)	4.6
Accrued interest on zero-coupon subordinated notes	0.3	1.6	2.0
Cumulative earnings less than distributions from equity method investments	0.5	1.2	0.1
Asset Impairment Charges	23.5	0.0	39.7
Deferred Income Tax Expense (Benefit)	(525.8)	54.7	(34.1)
Change in assets and liabilities (net of effects of acquisitions):
Increase in accounts receivable, net	(2.1)	(85.5)	(71.8)
Increase (Decrease) in Unbilled Receivables	(8.3)	(33.4)	(16.9)
Increase in inventories	(16.4)	(9.6)	(0.2)
(Increase) decrease in prepaid expenses and other	(20.3)	(20.5)	62.3
(Decrease) increase in accounts payable	85.6	(8.7)	30.7
Increase (Decrease) in Deferred Revenue	19.0	29.9	5.4
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities	(15.0)	(86.6)	(38.0)
Net cash provided by operating activities	1,459.4	1,175.9	982.4
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(312.9)	(278.9)	(255.8)
Proceeds from sale of assets	5.5	30.8	0.6
Proceeds from Sale of Equity Method Investments	0.0	13.5	8.0
Acquisition of licensing technology	2.5	0.0	0.0
Investments in equity affiliates	(36.2)	(12.5)	(11.7)
Acquisition of businesses, net of cash acquired	(1,882.6)	(548.6)	(3,736.0)
Net cash used for investing activities	(2,228.7)	(795.7)	(3,994.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from senior notes offerings	1,200.0	0.0	2,900.0
Proceeds from Issuance of Other Long-term Debt	750.0	0.0	1,000.0
Line of Credit Facility Payment	(493.0)	(150.0)	(285.0)
Proceeds from revolving credit facilities	1,392.2	139.5	60.0
Payments on revolving credit facilities	(1,392.2)	(139.5)	(60.0)
Payments on zero-coupon subordinated notes	(33.9)	(53.7)	(1.3)
Payment of debt issuance costs	(15.3)	0.0	(36.7)
Repayments of Long-term Capital Lease Obligations	(7.7)	(8.4)	(4.3)
Noncontrolling interest distributions	(1.0)	(2.1)	0.0
Excess tax benefits from stock based compensation	0.0	0.0	13.1
Net proceeds from issuance of stock to employees	73.6	70.6	98.9
Purchase of common stock	(338.1)	(43.9)	0.0
Net cash (used for) provided by financing activities	631.9	(649.8)	3,184.6
Deferred payments on acquisitions	(2.6)	(7.6)	(0.1)
Effect of exchange rate changes on cash and cash equivalents	20.5	(13.2)	(35.7)
Net (decrease) increase in cash and cash equivalents	(116.9)	(282.8)	136.4
Cash and cash equivalents at beginning of year	433.6	716.4	580.0
Cash and cash equivalents at end of year	$ 316.7	$ 433.6	$ 716.4