Income Taxes Income Taxes Disclosure (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2025
Income Tax Contingency [Line Items]
Deduction limit of GILTI tax			50.00%
Net tax provision due to enactment of the Tax Cuts and Jobs Act			$ 128.6
Expense on remeasurement of deferred taxes under Tax Act 2017			15.0
Transition tax expense recognized on enactment of U.S. Tax Act 2017		$ 113.6	92.3
Other Tax Expense (Benefit)	$ 21.3
Reduction in liability for Unrecognized Tax Benefits	85.0		85.0
Net Benefit to the Income Tax Provision	$ 52.0		$ 52.0
Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Deduction limit of GILTI tax				37.50%