Pensions and Postretirement Benefits (Summary of Pension Plan Asset Allocation By Level) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	$ 117.3	$ 125.7
Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	39.8	47.8
Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	29.1	29.0
Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	5.7	5.4
U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.4	7.0
Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	14.6	19.6
Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	6.8	7.5
Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.2	1.8
Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	12.7	7.6	$ 7.3
Level 1
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	103.1	115.9
Level 1 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	38.3	45.6
Level 1 | Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	29.1	29.0
Level 1 | Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	5.7	5.4
Level 1 | U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.4	7.0
Level 1 | Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	14.6	19.6
Level 1 | Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	6.8	7.5
Level 1 | Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.2	1.8
Level 1 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.5	2.2
Level 2 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.5	2.2
Level 2 | Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 2 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	12.7	7.6
Level 3 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0.0	0.0
Level 3 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	$ 12.7	$ 7.6