Pension, Post-Retirement and Post-Employment Plans - Fair Value of Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Sub-Total	$ 159.7	$ 158.6
Assets using NAV as a practical expedient	101.9	119.6
Total	261.6	278.2
Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	78.3	70.7
Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	11.2	10.7
Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	70.2	77.2
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total	31.1	26.3
Domestic equities | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	31.1	26.3
Domestic equities | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Domestic equities | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Foreign equities
Defined Benefit Plan Disclosure [Line Items]
Total		0.3
Foreign equities | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total		0.3
Foreign equities | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total		0.0
Foreign equities | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total		0.0
Mutual funds holding domestic securities
Defined Benefit Plan Disclosure [Line Items]
Total	5.5	4.9
Mutual funds holding domestic securities | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	5.5	4.9
Mutual funds holding domestic securities | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Mutual funds holding domestic securities | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
U.S. Treasuries
Defined Benefit Plan Disclosure [Line Items]
Total	4.9	5.0
U.S. Treasuries | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
U.S. Treasuries | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	4.9	5.0
U.S. Treasuries | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Mutual funds holding U.S. Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Total	12.0	11.9
Mutual funds holding U.S. Treasury Securities | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	12.0	11.9
Mutual funds holding U.S. Treasury Securities | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Mutual funds holding U.S. Treasury Securities | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Mutual funds holding fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total	14.6	16.1
Mutual funds holding fixed income securities | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	14.6	16.1
Mutual funds holding fixed income securities | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Mutual funds holding fixed income securities | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Insurance Buy-In Policy
Defined Benefit Plan Disclosure [Line Items]
Total	70.2	77.2
Insurance Buy-In Policy | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Insurance Buy-In Policy | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Insurance Buy-In Policy | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	70.2	77.2
Foreign public bonds
Defined Benefit Plan Disclosure [Line Items]
Total	5.1	2.9
Foreign public bonds | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Foreign public bonds | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	5.1	2.9
Foreign public bonds | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total	1.2	1.5
Corporate bonds | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Corporate bonds | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	1.2	1.5
Corporate bonds | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Designated benefit fund
Defined Benefit Plan Disclosure [Line Items]
Total		1.3
Designated benefit fund | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total		0.0
Designated benefit fund | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total		1.3
Designated benefit fund | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total		0.0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total	15.1	11.2
Cash and cash equivalents | Quoted prices in active markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	15.1	11.2
Cash and cash equivalents | Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0.0	0.0
Cash and cash equivalents | Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	$ 0.0	$ 0.0