Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax credits available to offset future tax liabilities
U.S. tax credits	$ 21.8us-gaap_TaxCreditCarryforwardAmount
Undistributed earnings of foreign subsidiaries on which U.S. income taxes are not provided	1,195.6
Unrecognized deferred U.S. income taxes on undistributed earnings of foreign subsidiaries	40
Portion of unrecognized tax benefits, excluding interest, which if recognized, would result in a reduction of the effective tax rate	12.8
Reasonably possible reduction in unrecognized tax benefits due to statutes of limitations expiring and favorably settling with taxing authorities, low end of range	2
Reasonably possible reduction in unrecognized tax benefits due to statutes of limitations expiring and favorably settling with taxing authorities, high end of range	3
Reconciliation of beginning and ending amount of unrecognized tax benefits
Gross unrecognized tax benefits at the beginning of the year	32.7us-gaap_UnrecognizedTaxBenefits	42.1us-gaap_UnrecognizedTaxBenefits	34.6us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior periods			5.9
Gross decreases - tax positions in prior periods	(3.1)	(0.5)	(2.2)
Gross increases - current period tax positions	0.9	0.7	12.0
Settlements	(0.6)	(7.1)	(4.6)
Lapse of statutes	(2.9)	(2.5)	(3.6)
Gross unrecognized tax benefits at the end of the year	27.0us-gaap_UnrecognizedTaxBenefits	32.7us-gaap_UnrecognizedTaxBenefits	42.1us-gaap_UnrecognizedTaxBenefits
Accrued interest and penalties related to uncertain tax positions	3.6	3.8
Penalties and interest expense relating to unrecognized tax benefits	0.1	0.9
Research and development
Tax credits available to offset future tax liabilities
U.S. tax credits	12.8
Foreign tax credits
Tax credits available to offset future tax liabilities
U.S. tax credits	$ 9.0

Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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