Pension, Post-Retirement and Post-Employment Plans - Fair Value of Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total	$ 189.0	$ 207.3
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	168.9	162.6
Assets using net asset value (or NAV) as a practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total	20.1	44.7
Domestic equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	22.0	31.8
Foreign equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	3.9	18.3
Mutual funds holding domestic securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	4.0
U.S. Treasury bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total	21.5	14.6
Mutual funds holding U.S. Treasury Securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	19.0	9.2
Mutual funds holding fixed income securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	96.3	74.6
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total	$ 6.2	$ 10.1