CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Deferred Revenue, Revenue Recognized	$ 250.2	$ 204.0
Prior Period Reclassification Adjustment		44.4
Current assets:
Cash and cash equivalents	337.5	426.8
Accounts receivable	1,543.9	1,467.9
Unbilled Contracts Receivable	481.4	394.4
Supplies inventory	244.7	237.3
Prepaid expenses and other	373.7	309.0
Total current assets	2,981.2	2,835.4
Property, plant and equipment, net	2,636.6	1,740.3
Goodwill, net	7,865.0	7,360.3
Intangible assets, net	4,034.5	3,911.1
Joint venture partnerships and equity method investments	84.9	60.5
Deferred Income Tax Assets, Net	8.8	1.7
Other assets, net	435.4	276.0
Total assets	18,046.4	16,185.3
Current liabilities:
Accounts payable	632.3	634.6
Accrued expenses and other	942.4	870.0
Deferred Revenue, Current	451.0	356.4
Short-term borrowings and current portion of long-term debt	415.2	10.0
Total current liabilities	2,655.8	1,878.9
Long-term debt, less current portion	5,789.8	5,990.9
Operating Lease, Liability, Noncurrent	596.6	0.0
Finance Lease, Liability, Noncurrent	91.1	51.0
Deferred income taxes and other tax liabilities	942.8	940.0
Other liabilities	383.2	334.0
Total liabilities	10,459.3	9,194.8
Commitments and contingent liabilities
Noncontrolling interest	20.1	19.1
Shareholders’ equity
Common stock, 97.2 and 98.9 shares outstanding at December 31, 2019 and 2018, respectively	9.0	11.7
Additional paid-in capital	26.8	1,451.1
Retained earnings	7,903.6	7,079.8
Less common stock held in treasury	0.0	(1,108.1)
Accumulated other comprehensive loss	(372.4)	(463.1)
Total shareholders’ equity	7,567.0	6,971.4
Total liabilities and shareholders’ equity	18,046.4	16,185.3
Operating Lease, Liability, Current	206.5	0.0
Finance Lease, Liability, Current	$ 8.4	$ 7.9