Pension and Other Retiree Benefits (Narrative) (Details) $ in Millions		12 Months Ended
		Dec. 31, 2018 USD ($) yr	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of post-retirement plans not frozen to new participants		1
Pension and post-retirement benefit obligations		$ 257.2	$ 275.5
Employer contributions		20.9
Expected contributions to defined benefit plans for 2019		21.0
Costs related to defined contribution plans		$ 13.3	13.4	$ 11.3
Defined Contribution Plan, Increase (Decrease), Cost			2.1
Minimum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants | yr		60
Maximum
Defined Benefit Plan Disclosure [Line Items]
Payment of retirement benefits, commencement age for participants | yr		65
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 806.1	887.9
Pension Plan | U.S.
Defined Benefit Plan Disclosure [Line Items]
Pension and post-retirement benefit obligations	[1]	47.2	44.4
Employer contributions		$ 5.7	$ 7.3
Pension Plan | U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		60.00%
Pension Plan | U.S. | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		28.00%
Pension Plan | U.S. | Alternate assets
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		12.00%

[1] Pension and post-retirement benefit obligations of $257.2 million as of December 31, 2018, decreased from $275.5 million as of December 31, 2017, primarily due to cash contributions and favorable foreign currency translation.