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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	22.00%	23.00%	17.00%	22.00%
income tax benefit related to tax act			$ 12.1
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ 6.0	$ 6.7
Statutory federal rate	21.00%	35.00%
Tax Credit Carryforward, Amount					$ 67.9
Foreign Earnings Repatriated			1,150.0
Deferred Tax Liabilities, Undistributed Foreign Earnings			60.7
Deferred Tax Liabilities, Gross, Noncurrent	$ 85.0		85.0
Liabilities, Other than Long-term Debt, Noncurrent	8.1		8.1
Income Taxes Paid	8.5
Deferred Tax Liabilities, Financing Arrangements	$ 439.2		$ 439.2

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Amount of deferred tax liability attributable to taxable temporary differences from financing arrangements.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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