RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2014-09 - Hypothetical Results Under Previous Standard (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue	$ 680.6	$ 645.0	$ 2,066.7	$ 1,901.7
Costs of revenue	454.1	441.2	1,390.0	1,289.8
Income tax expense	25.9	40.6	42.4	60.3
Net income	111.1	$ 86.9	282.3	$ 180.4
Receivables, net	562.9		562.9		$ 629.6
Inventories, net	391.4		391.4		311.9
Total current assets	151.8		151.8		147.4
Deferred income taxes	163.6		163.6		149.9
Other non-current assets	205.8		205.8		202.9
Accrued liabilities	416.9		416.9		384.4
Other non-current liabilities	165.5		165.5		175.6
Retained earnings	2,065.7		2,065.7		$ 1,856.1
Hypothetical Amount Under Previous Standard [Member] | Accounting Standards Update 2014-09 [Member]
Revenue	683.9		2,078.2
Costs of revenue	456.4		1,399.6
Income tax expense	25.9		42.6
Net income	112.1		284.0
Receivables, net	613.5		613.5
Inventories, net	320.2		320.2
Total current assets	130.5		130.5
Deferred income taxes	162.4		162.4
Accrued liabilities	367.0		367.0
Other non-current liabilities	166.5		166.5
Retained earnings	2,071.5		2,071.5
Hypothetical Effect of Change Due to Adoption of New Accounting Pronouncement [Member] | Accounting Standards Update 2014-09 [Member]
Revenue	3.3		11.5
Costs of revenue	2.3		9.6
Income tax expense	0.0		0.2
Net income	1.0		1.7
Receivables, net	50.6		50.6
Inventories, net	(71.2)		(71.2)
Total current assets	(21.3)		(21.3)
Deferred income taxes	(1.2)		(1.2)
Accrued liabilities	(49.9)		(49.9)
Other non-current liabilities	1.0		1.0
Retained earnings	$ 5.8		$ 5.8