Fair Value Measurements (Details 2) (Assets and liabilities measured on a nonrecurring basis, USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Level 3
Major categories of assets and liabilities measured on a recurring basis, at fair value
Property, plant and equipment, net	$ 97.1	$ 86.1
Goodwill	55.8	55.8
Intangible assets, net	23.5	25.9
Total	176.4	167.8
Fair Value
Major categories of assets and liabilities measured on a recurring basis, at fair value
Property, plant and equipment, net	97.1	86.1
Goodwill	55.8	55.8
Intangible assets, net	23.5	25.9
Total	$ 176.4	$ 167.8