Pension Plans and Other Postretirement Benefits Pension and Postretirement Plan Contributions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions	$ 4.5us-gaap_PensionContributions	$ 1.1us-gaap_PensionContributions
Other Postretirement Benefits Payments	1.5	1.4
Rockwood Holdings, Inc. \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected Contributions to Rockwood Pension Plans for the Remainder of 2015	$ 3.4

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund non-pension postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

+ Details

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

+ Details

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