Other Long-Term Liabilities (Schedule of Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Long-term deferred compensation arrangements	$ 13.8	$ 14.0
Environmental liabilities	1.6	11.7
Fair value of derivative liabilities	15.9	6.1
Other	6.6	6.2
Total other long-term liabilities	$ 37.9	$ 38.0

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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