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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Tax cuts and jobs act of 2017, income tax benefit		$ 10.0
Tax cuts and jobs act of 2017, provisional income tax benefit, change in tax rate		16.0
Tax cuts and jobs act of 2017, provisional income tax expense, transition tax for accumulated foreign earnings		7.0
Cumulative foreign earnings		101.0
Current year cash dividends, income tax benefit		1.0
Current and prior year undistributed earnings of subsidiaries operating outside the U.S.		$ 151.0
Income tax benefit	$ 0.2		$ 8.0	$ 3.7	$ 17.9
Effective tax rate	(18.20%)		41.20%	27.00%	40.50%

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