Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Valuation allowance
Valuation allowance	$ 95.6	$ 107.3
Net decrease in U.S. and foreign valuation allowances	11.7	71.4
Estimated cumulative amount of earnings from foreign subsidiaries that are permanently invested	609.3
U.S. Federal
Valuation allowance
Valuation allowance	46.8	58.1
Deferred tax assets \| U.S. Federal
Valuation allowance
Valuation allowance	0.0	10.4
Deferred tax assets \| State
Valuation allowance
Valuation allowance	34.1	36.5
Tax credit carryforward \| Foreign
Valuation allowance
Valuation allowance	12.7	11.2
Net operating loss (NOL) carry forwards \| Foreign
Valuation allowance
Valuation allowance	$ 48.8	$ 49.2
Minimum
Valuation allowance
Foreign statutory income tax rate	0.00%
Maximum
Valuation allowance
Foreign statutory income tax rate	48.00%

Effective Income Tax Rate Reconciliation, at Foreign Statutory Income Tax Rate, Percent

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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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.

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