Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Amortization period for gains and losses, period 1					3 years
Amortization period for gains and losses, period 2					5 years
Loss contingency	$ 0.0	$ 0.0	$ 18.2	$ 0.0	$ 0.0	$ 18.2	$ 0.0
Postemployment benefits liability	$ 9.7				$ 9.2	$ 9.7
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	2.66%				3.06%	2.66%
Rate of return on assets					5.23%
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 28.2				$ 26.0	$ 28.2	26.0
Qualified pension plans, plan assets	$ 0.0				$ 0.0	$ 0.0	0.0
Weighted average discount rate	4.75%				5.17%	4.75%
Minimum | U.S. Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations					$ 5.0
Minimum | International Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations					10.0
Maximum | U.S. Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations					10.0
Maximum | International Pension and Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions related to continuing operations					$ 15.0
Discontinued Operations | U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan liabilities							499.6
Divestiture							355.9
Discontinued Operations | United States Postretirement Benefit Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan liabilities							60.4
UK Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Rate of return on assets					5.20%
UK Pension Plan | Equity Securities, Emerging Market Debt and High Yield Securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities allocation					20.00%
Expected long term rate of return on equity securities, minimum					5.00%
Expected long term rate of return on equity securities, maximum					9.00%
UK Pension Plan | Corporate and Government Bonds
Defined Benefit Plan Disclosure [Line Items]
assumptions used calculating net periodic benefit allocation, debt securities allocation					80.00%
Expected long term rate of return on debt securities, minimum					2.00%
Expected long term rate of return on debt securities, maximum					4.00%
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 88.9				$ 74.7	$ 88.9	87.6
Qualified pension plans, plan assets	$ 63.1				$ 62.7	$ 63.1	$ 51.4
Weighted average discount rate	3.48%				4.24%	3.48%
Rate of return on assets					5.50%	5.50%	7.00%
Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 714.2				$ 617.0	$ 714.2	$ 652.9
Qualified pension plans, plan assets	$ 705.4				$ 615.8	$ 705.4	$ 613.7
Weighted average discount rate	2.56%				2.91%	2.56%
Rate of return on assets					5.20%	5.09%	6.40%
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Loss contingency			$ 18.2
UK Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Employer match toward contributions, doubled					5.00%
Maximum contribution percent of eligible compensation					10.00%
Employer contribution					$ 5.9	$ 6.7	$ 6.5
Personal Savings Account Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution					$ 2.2	2.6	$ 3.8
Maximum employee contribution to plan					25.00%
Maximum contribution for eligible participants					3.00%
Employer match toward contributions, fifty cents for dollar, minimum					4.00%
Employer match toward contributions, fifty cents for dollar, maximum					6.00%
Retirement Savings Account Plan
Defined Benefit Plan Disclosure [Line Items]
Employer match toward contributions, fifty cents for dollar, minimum					3.00%
Employer match toward contributions, fifty cents for dollar, maximum					6.00%
Vesting period					3 years
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	$ 76.7				$ 65.4	76.7
Qualified pension plans, plan assets	63.0				$ 62.7	63.0
U.S. Qualified Pension Plan | Corporate and Government Bonds
Defined Benefit Plan Disclosure [Line Items]
assumptions used calculating net periodic benefit allocation, debt securities allocation					70.00%
Expected long term rate of return on debt securities, minimum					3.00%
Expected long term rate of return on debt securities, maximum					5.00%
U.S. Qualified Pension Plan | Equity Securities and High Yield Securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities allocation					30.00%
Expected long term rate of return on equity securities, minimum					6.00%
Expected long term rate of return on equity securities, maximum					8.00%
UK Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Qualified pension plans, benefit obligations	494.0				$ 416.5	494.0
Qualified pension plans, plan assets	$ 573.6				$ 501.7	$ 573.6