Benefit Plans (Amounts Recognized in Balane Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	$ (2.8)	$ (2.3)
Noncurrent liabilities	(135.4)	(126.0)
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(1.6)	(1.2)
Noncurrent liabilities	(110.6)	(105.4)
Total liabilities	(112.2)	(106.6)
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(1.2)	(1.1)
Noncurrent liabilities	(24.8)	(20.6)
Total liabilities	$ (26.0)	$ (21.7)