COMPREHENSIVE INCOME - BALANCES INCLUDED IN AOCI, NET OF TAX, IN THE CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ 8,125.9	$ 2,339.4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	$ 1.0	$ (0.4)	2.4	(1.0)
Total other comprehensive income (loss), net of tax	220.6	(83.4)	268.2	79.5
Ending Balance	7,274.2	8,315.6	7,274.2	8,315.6
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(705.7)	(594.0)
Other comprehensive income (loss) before reclassifications and tax impact			238.9	64.2
Tax (expense) benefit			26.4	16.2
Other comprehensive income (loss), net of tax, before reclassifications			265.3	80.4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			2.4	(1.0)
Total other comprehensive income (loss), net of tax			267.7	79.4
Ending Balance	(438.0)	(514.6)	(438.0)	(514.6)
Foreign Currency Translation Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(490.5)	(401.2)
Other comprehensive income (loss) before reclassifications and tax impact			245.8	86.0
Tax (expense) benefit			25.4	7.9
Other comprehensive income (loss), net of tax, before reclassifications			271.2	93.9
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0.0	0.0
Total other comprehensive income (loss), net of tax			271.2	93.9
Ending Balance	(219.3)	(307.3)	(219.3)	(307.3)
Gain and (Loss) on Derivative Financial Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(3.2)	(1.2)
Other comprehensive income (loss) before reclassifications and tax impact			(2.7)	(4.6)
Tax (expense) benefit			0.2	1.7
Other comprehensive income (loss), net of tax, before reclassifications			(2.5)	(2.9)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0.1	(2.8)
Total other comprehensive income (loss), net of tax			(2.4)	(5.7)
Ending Balance	(5.6)	(6.9)	(5.6)	(6.9)
Gain and (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(116.8)	(110.2)
Other comprehensive income (loss) before reclassifications and tax impact			(4.2)	(17.2)
Tax (expense) benefit			0.8	6.6
Other comprehensive income (loss), net of tax, before reclassifications			(3.4)	(10.6)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0.0	0.0
Total other comprehensive income (loss), net of tax			(3.4)	(10.6)
Ending Balance	(120.2)	(120.8)	(120.2)	(120.8)
Pension Liability Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(95.2)	(81.4)
Other comprehensive income (loss) before reclassifications and tax impact			0.0	0.0
Tax (expense) benefit			0.0	0.0
Other comprehensive income (loss), net of tax, before reclassifications			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			2.3	1.8
Total other comprehensive income (loss), net of tax			2.3	1.8
Ending Balance	$ (92.9)	$ (79.6)	$ (92.9)	$ (79.6)