Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Accounts receivable	$ 3.7	$ 4.8
Deferred compensation	45.5	69.7
Pension, postretirement and postemployment benefits	7.5	7.7
Investment in Natronx	0.0	7.7
Other	23.4	30.8
Tax credit carryforwards/other tax attributes	3.9	12.8
International operating loss carryforwards	11.6	8.0
Total gross deferred tax assets	95.6	141.5
Valuation allowances	(23.5)	(20.2)
Total deferred tax assets	72.1	121.3
Goodwill	(153.6)	(212.3)
Trade names and other intangibles	(411.8)	(322.9)
Property, plant and equipment	(65.8)	(97.1)
Total deferred tax liabilities	(631.2)	(632.3)
Net deferred tax liability	(559.1)	(511.0)
Long term net deferred tax asset	2.1	1.2
Long term net deferred tax liability	$ (561.2)	$ (512.2)