Pensions and Postretirement Benefits (Summary of Pension Plan Asset Allocation By Level) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	$ 125.7	$ 125.4
Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	47.8	50.8
Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	26.9	26.9
Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	5.4	5.6
U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.0	5.1
Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	19.6	18.8
Balanced funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	2.1	2.1
Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.5	6.8
Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.8	2.0
Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.6	7.3	6.4
Level 1
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	115.9	115.6
Level 1 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	45.6	48.3
Level 1 | Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	26.9	26.9
Level 1 | Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	5.4	5.6
Level 1 | U.S. Government obligations
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.0	5.1
Level 1 | Fixed income funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	19.6	18.8
Level 1 | Balanced funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	2.1	2.1
Level 1 | Corporate Bonds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.5	6.8
Level 1 | Cash and Cash Equivalents
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	1.8	2.0
Level 1 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0	0
Level 2
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	2.2	2.5
Level 2 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	2.2	2.5
Level 2 | Equity Funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	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
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
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
Level 2 | Balanced funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	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
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
Level 2 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	0	0
Level 3
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	7.6	7.3
Level 3 | Common stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	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
Level 3 | Foreign Stock
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	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
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
Level 3 | Balanced funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	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
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
Level 3 | Hedge funds
Schedule of pension plans assets by level within the fair value hierarchy
Fair value of pension plan assets	$ 7.6	$ 7.3