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CHANGES IN SIGNIFICANT ACCOUNTING POLICIES - Total undiscounted lease liability maturities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Disclosure of maturity analysis of operating lease payments
Total undiscounted lease liability maturities	$ 65.4
2020
Disclosure of maturity analysis of operating lease payments
Total undiscounted lease liability maturities	16.0
2021-2024
Disclosure of maturity analysis of operating lease payments
Total undiscounted lease liability maturities	31.7
2025+
Disclosure of maturity analysis of operating lease payments
Total undiscounted lease liability maturities	$ 17.7

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The amount of undiscounted operating lease payments. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset.

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