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Retirement Plans and Other Investment Categories (Details 3) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	$ 118.5	$ 117.1	$ 123.1
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	116.0	114.6
U.S. Pension Benefits | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.5	2.5
U.S. Pension Benefits | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Cash, including money market funds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.5	2.5
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.5	2.5
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	27.6	28.6
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	27.6	28.6
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	8.7	8.7
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	8.7	8.7
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	55.8	56.4
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	55.8	56.4
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	16.4	12.7
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	16.4	12.7
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.6	0.3
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.6	0.3
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Other securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.9	7.9
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	6.9	7.9
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	121.2	108.3	$ 111.2
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.9	2.1
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	118.3	106.2
Non-U.S. Pension Benefits | Cash, including money market funds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.9	2.1
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	2.9	2.1
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.4	5.9
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	6.4	5.9
Non-U.S. Pension Benefits | Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	24.4	21.2
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	24.4	21.2
Non-U.S. Pension Benefits | U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.6	0.9
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.6	0.9
Non-U.S. Pension Benefits | Non-U.S. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	19.3	17.7
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	19.3	17.7
Non-U.S. Pension Benefits | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.6
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.6
Non-U.S. Pension Benefits | Non-U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	32.7	29.3
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	32.7	29.3
Non-U.S. Pension Benefits | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	3.5	2.8
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	3.5	2.8
Non-U.S. Pension Benefits | Other securities
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	31.4	27.8
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets	0.0	0.0
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	0.0	0.0
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments measured at fair value	$ 31.4	$ 27.8

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Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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