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Defined Contribution Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States Pension Plans Of US Entity, Defined Contribution [Member] | UNITED STATES
Defined Contribution Plan Disclosure [Line Items]
Expense recognized	$ 26.8	$ 26.5	$ 25.3
Supplemental matching	5.4	4.8	4.3
Foreign Pension Plans, Defined Contribution [Member] | UNITED KINGDOM
Defined Contribution Plan Disclosure [Line Items]
Expense recognized	$ 3.6	$ 4.0	$ 4.5

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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