LEASES - Balance Sheet Classification (Details) $ in Millions	Sep. 30, 2019 USD ($)
Assets:
Operating lease assets	$ 69.3
Finance lease assets	98.0
Total lease assets	167.3
Current liabilities:
Operating	13.5
Finance	26.6
Long-term liabilities:
Operating	58.6
Finance	45.5
Total lease liabilities	144.2
Finance lease assets, accumulated amortization	$ 23.6