Postretirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Non-current assets	$ 259.7	$ 223.5
Amounts recognized on the Consolidated Balance Sheets:
Non-current assets	259.7	223.5
Current liabilities	(5.6)
Non-current liabilities	(133.6)
Total	120.5
Postretirement Benefit Plans [Member]
Amounts recognized on the Consolidated Balance Sheets:
Current liabilities	(23.0)
Non-current liabilities	(123.9)
Total	$ (146.9)