RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2014-09 - Hypothetical Results Under Previous Standard (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue	$ 696.8	$ 630.9	$ 1,386.1	$ 1,256.7
Costs of revenue	470.8	425.9	935.9	848.6
Income tax expense	8.9	10.6	16.5	19.7
Net income	69.9	$ 47.9	171.2	$ 93.5
Receivables, net	560.4		560.4		$ 629.6
Inventories, net	393.5		393.5		311.9
Total current assets	175.1		175.1		147.4
Deferred income taxes	164.0		164.0		149.9
Other non-current assets	203.2		203.2		202.9
Accrued liabilities	397.7		397.7		384.4
Other non-current liabilities	172.7		172.7		175.6
Retained earnings	1,959.3		1,959.3		$ 1,856.1
Hypothetical Amount Under Previous Standard [Member] | Accounting Standards Update 2014-09 [Member]
Revenue	699.2		1,394.3
Costs of revenue	472.4		943.2
Income tax expense	8.7		16.7
Net income	70.5		171.9
Receivables, net	614.9		614.9
Inventories, net	324.0		324.0
Total current assets	150.3		150.3
Deferred income taxes	162.7		162.7
Accrued liabilities	350.8		350.8
Other non-current liabilities	173.7		173.7
Retained earnings	1,964.1		1,964.1
Hypothetical Effect of Change Due to Adoption of New Accounting Pronouncement [Member] | Accounting Standards Update 2014-09 [Member]
Revenue	2.4		8.2
Costs of revenue	1.6		7.3
Income tax expense	0.2		0.2
Net income	0.6		0.7
Receivables, net	54.5		54.5
Inventories, net	(69.5)		(69.5)
Total current assets	(24.8)		(24.8)
Deferred income taxes	(1.3)		(1.3)
Accrued liabilities	(46.9)		(46.9)
Other non-current liabilities	1.0		1.0
Retained earnings	$ 4.8		$ 4.8