Benefit Plans (Amounts Recognized in Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	$ (2.6)	$ (2.2)
Noncurrent liabilities	(83.7)	(83.1)
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(1.8)	(1.5)
Noncurrent liabilities	(74.4)	(74.6)
Total liabilities	(76.2)	(76.1)
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(0.8)	(0.7)
Noncurrent liabilities	(9.3)	(8.5)
Total liabilities	$ (10.1)	$ (9.2)