Benefit Plans (Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
2018	$ 15.3
2019	16.3
2020	17.8
2021	17.2
2022	18.1
2023 to 2027	89.5
Total benefit payments expected	174.2
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
2018	13.3
2019	14.2
2020	15.2
2021	14.7
2022	15.1
2023 to 2027	72.3
Total benefit payments expected	144.8
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
2018	2.0
2019	2.1
2020	2.6
2021	2.5
2022	3.0
2023 to 2027	17.2
Total benefit payments expected	$ 29.4