Employee Benefit Plans Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	$ 1.2	$ 2.3
Noncurrent Pension Liability	127.8	134.8
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	129.0	137.1
Net Actuarial Gain (Loss) in Balance Sheet	13.7	10.1
Prior Service Credit in Balance Sheet	3.5	3.9
Pension Recognized in Balance Sheet, Gross of Deferred Tax	17.2	14.0
Pension Deferred Tax Asset in Balance Sheet	4.7	5.3
Pension Recognized in Balance Sheet, Net of Deferred Tax	21.9	19.3	$ 14.5
Domestic Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	7.2	7.0
Noncurrent Pension Liability	547.1	494.2
Noncurrent Pension Asset	0.0	0.0
Funded Status of Plan	554.3	501.2
Net Actuarial Gain (Loss) in Balance Sheet	(746.4)	(702.1)
Prior Service Credit in Balance Sheet	(0.7)	7.2
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(747.1)	(694.9)
Pension Deferred Tax Asset in Balance Sheet	251.8	243.6
Pension Recognized in Balance Sheet, Net of Deferred Tax	(495.3)	(451.3)	(387.9)
Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Current Pension Liability	0.0	0.0
Noncurrent Pension Liability	0.0	0.0
Noncurrent Pension Asset	(9.7)	(5.4)
Funded Status of Plan	(9.7)	(5.4)
Net Actuarial Gain (Loss) in Balance Sheet	(46.3)	(44.0)
Prior Service Credit in Balance Sheet	0.0	0.0
Pension Recognized in Balance Sheet, Gross of Deferred Tax	(46.3)	(44.0)
Pension Deferred Tax Asset in Balance Sheet	11.6	10.9
Pension Recognized in Balance Sheet, Net of Deferred Tax	$ (34.7)	$ (33.1)	$ (19.2)