RESTRUCTURING AND DIVESTITURES - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended		3 Months Ended								12 Months Ended
	Feb. 06, 2020	Aug. 31, 2019	Dec. 31, 2016	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring charges												$ 12.0	$ 27.4
Non-cash impairment charges													9.1	$ 2.4
Employee termination														11.5
Payments for restructuring liability											$ 2.2
Gain (loss) on divestiture of business				$ (24.9)	$ (83.2)	$ (0.3)	$ 5.4	$ 0.2	$ (1.6)	$ (7.3)	$ (4.1)	(103.0)	(12.8)	(9.5)
Proceeds from sale of business												$ 86.6	25.2	1.2
ESOL Disposal Group | Subsequent Event
Restructuring Cost And Reserve [Line Items]
Purchase price for transaction	$ 462.5
United Kingdom | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business														(5.7)
Proceeds from sale of business														1.2
South Africa | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business														3.0
Proceeds from sale of business														7.3
TAS
Restructuring Cost And Reserve [Line Items]
TSA period												15 months
Allocated and deferred amount				5.1								$ 5.1
TAS | North America
Restructuring Cost And Reserve [Line Items]
Consideration for sale of business				36.4								36.4
Gain (loss) on divestiture of business												(45.5)
Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges													3.7
Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges												$ 4.7	27.4
Restructuring charges approximate paid over period												2 years
Restructuring charges future payments accrued				$ 3.0								$ 3.0
Non-cash impairment charges												0.9	7.8	7.3
Employee termination												1.7	1.3
Selling, General and Administrative Expenses | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges													2.4
Selling, General and Administrative Expenses | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges												5.5
Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Restructuring charges												7.3
Non-cash impairment charges												10.8	25.3
Employee termination												0.6
Cost of Revenues | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges												1.6	25.0
International RWCS
Restructuring Cost And Reserve [Line Items]
Restructuring charges												8.2	17.4
International RWCS | United Kingdom
Restructuring Cost And Reserve [Line Items]
Consideration for sale of business								$ 11.5					11.5
Gain (loss) on divestiture of business												5.1
Proceeds from sale of business													8.2
Impairment charges and subsequent loss on disposal													16.5
Consideration from business sale held in escrow		$ 3.0
Impairment charges			$ 3.8
International RWCS | United Kingdom | Patient Transport Business
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business												0.3
International RWCS | United Kingdom | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business												5.1
Proceeds from sale of business												14.8
International RWCS | Mexico
Restructuring Cost And Reserve [Line Items]
Impairment charges and subsequent loss on disposal												43.2
Cumulative foreign currency translation adjustment												18.9
International RWCS | Chile
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business												(19.0)
Proceeds from sale of business												30.7
Cumulative foreign currency translation adjustment												16.8
International RWCS | South Africa
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business														3.0
International RWCS | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges													0.3	3.3
International RWCS | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges												3.3	17.4
Non-cash impairment charges												0.4	5.1
Employee termination												0.7	0.2
International RWCS | Selling, General and Administrative Expenses | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges												0.7
International RWCS | Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Restructuring charges												4.9
Non-cash impairment charges												7.5
Employee termination												0.2
International RWCS | Cost of Revenues | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges												0.3
North America RWCS
Restructuring Cost And Reserve [Line Items]
Restructuring charges												2.4	5.2
North America RWCS | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Proceeds from sale of business													17.0
Impairment charges and subsequent loss on disposal													6.9
North America RWCS | TAS | North America
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business												(6.5)
North America RWCS | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges													3.0	5.5
North America RWCS | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges												0.4	5.2
Non-cash impairment charges												0.5	1.3
Employee termination												0.4
North America RWCS | Selling, General and Administrative Expenses | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges													1.0
North America RWCS | Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Restructuring charges												2.0
Non-cash impairment charges												2.0	7.7
North America RWCS | Cost of Revenues | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges													7.4
North America RWCS | Cost of Revenues | Other Long-term Assets
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges													0.3
All Other
Restructuring Cost And Reserve [Line Items]
Restructuring charges												1.4	4.8
All Other | TAS | North America
Restructuring Cost And Reserve [Line Items]
Gain (loss) on divestiture of business												(39.0)
All Other | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges													0.4	$ 5.1
All Other | Selling, General and Administrative Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring charges												1.0	4.8
Non-cash impairment charges													1.4
Employee termination												0.6	1.1
All Other | Selling, General and Administrative Expenses | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges													1.4
All Other | Selling, General and Administrative Expenses | Employee Severance
Restructuring Cost And Reserve [Line Items]
Restructuring charges												4.8
All Other | Cost of Revenues
Restructuring Cost And Reserve [Line Items]
Restructuring charges												0.4
Non-cash impairment charges												1.3	17.6
Employee termination												0.4
All Other | Cost of Revenues | Software
Restructuring Cost And Reserve [Line Items]
Non-cash impairment charges												$ 1.3	$ 17.6