Pension and Other Post-Retirement Benefit Plans (Accumulated Other Comprehensive Income As A Component Of Net Period Benefit Cost) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Other Post-retirement Benefits
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Net actuarial losses (gains)	$ 0.0
Prior service cost (credit)	0.0
U.S. | Pensions
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Net actuarial losses (gains)	0.0
Prior service cost (credit)	0.0
International | Pensions
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Net actuarial losses (gains)	1.2
Prior service cost (credit)	$ 1.1