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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash paid during the period:
Interest	$ 2.8	$ 1.3
Income taxes	0.0	0.0
Operating leases	15.7	0.0
Non-cash investing and financing activities:
Unsettled purchases of investment securities accrued at period end	0.0	3.5
Lease liabilities recognized in exchange for lease right-of-use assets	$ 5.1	$ 0.0

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Cash Paid For Operating Leases

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Value of investments transferred to the entity's investments in noncash transactions.

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