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Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 3.4	$ 6.9
Operating cash flows from finance leases	0.5	1.1
Financing cash flows from finance leases	0.0	0.0
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	1.1	1.9
Finance leases	$ 0.0	$ 0.0

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Amount of interest paid on finance lease liability.

+ References

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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