Employee Benefit Plans Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising from Plan Amendment, before Tax	$ 0.0	$ 3.7
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	19.3	14.5
Amortization of Net Actuarial Loss	0.0	0.0	$ 0.0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	3.6	3.9
Amortization of Prior Service Cost (Credit)	(0.4)	(0.2)	(0.3)
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	(0.6)	(2.6)
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	21.9	19.3	14.5
Domestic Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising from Plan Amendment, before Tax	(7.6)	0.0
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	(451.3)	(387.9)
Amortization of Net Actuarial Loss	19.6	16.2	11.6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(63.9)	(114.1)
Amortization of Prior Service Cost (Credit)	(0.3)	(0.3)	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	8.2	34.8
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	(495.3)	(451.3)	(387.9)
Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising from Plan Amendment, before Tax	0.0	0.0
Pension Recognized in Balance Sheet, Net of Deferred Tax, Beginning of Year	(33.1)	(19.2)
Amortization of Net Actuarial Loss	0.7	0.1	0.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(3.0)	(16.0)
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	0.7	2.0
Pension Recognized in Balance Sheet, Net of Deferred Tax, End of Year	$ (34.7)	$ (33.1)	$ (19.2)