FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT - GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 59.2	$ 14.7
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0.0	0.0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	59.2	14.7
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0.0	$ 0.0
Nonrecurring | Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Identifiable intangible assets, net	1,998.8
Goodwill, net	1,980.6
Total assets	3,979.4
Nonrecurring | Estimate of Fair Value, Fair Value Disclosure | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Identifiable intangible assets, net	0.0
Goodwill, net	0.0
Total assets	0.0
Nonrecurring | Estimate of Fair Value, Fair Value Disclosure | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Identifiable intangible assets, net	0.0
Goodwill, net	0.0
Total assets	0.0
Nonrecurring | Estimate of Fair Value, Fair Value Disclosure | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Identifiable intangible assets, net	1,998.8
Goodwill, net	1,980.6
Total assets	$ 3,979.4