Pension and Post-retirement and Other Benefit Plans - Actual Pension Plans' Asset Allocations by Level Within the Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 227.3	$ 260.7
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3.9	2.4
Equity securities, Large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	42.5	45.5
Equity securities, Small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	66.8	79.1
Government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	12.7	17.6
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	57.8	46.4
Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	43.6	69.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	133.1	123.3
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	3.9	2.4
Level 1 | Equity securities, Large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 1 | Equity securities, Small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	66.8	79.1
Level 1 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 1 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	45.6	15.2
Level 1 | Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	16.8	26.6
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	94.2	137.4
Level 2 | Equity securities, Large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	42.5	45.5
Level 2 | Equity securities, Small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 2 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	12.7	17.6
Level 2 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	12.2	31.2
Level 2 | Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	26.8	43.1
Level 3 | Equity securities, Large cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 3 | Equity securities, Small cap
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 3 | Government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 3 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0.0	0.0
Level 3 | Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 0.0	$ 0.0