Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) Reclassifications out of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amounts Reclassified from Accumulated Other Comprehensive Loss, Total Before Tax	$ 0		$ 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Hedging, Tax	0	0	(0.1)	(1.7)
Amounts Reclassified from Accumulated Other Comprehensive Income Loss, Hedging, Net of Tax	0	0	0.1	3.3
Amounts Reclassified from Accumulated Other Comprehensive Loss, Net of Tax and Noncontrolling Interest	(1.1)		(1.9)
Commodity Contract [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss, Total Before Tax	0		0.2
Interest Rate Swap [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss, Total Before Tax	0		(0.2)
Pension Plan [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss, Gain (Loss)	(1.8)		(3.1)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Prior Service Cost	(0.1)		(0.1)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Total Before Tax	(1.9)		(3.2)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Tax Benefit	(0.9)		(1.3)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Net of Tax	(1.0)		(1.9)
Amount Reclassified from Accumulated Other Comprehensive Loss, Noncontrolling Interest	0		(0.1)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Net of Tax and Noncontrolling Interest	(1.0)		(1.8)
Postretirement Benefit Plan [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss, Gain (Loss)	(0.8)		(1.6)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Prior Service Cost	0.6		1.4
Amounts Reclassified from Accumulated Other Comprehensive Loss, Total Before Tax	(0.2)		(0.2)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Tax Benefit	(0.1)		(0.1)
Amounts Reclassified from Accumulated Other Comprehensive Loss, Net of Tax	$ (0.1)		$ (0.1)