Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Single employer pension and postretirement obligations	$ 294.9	$ 300.9
Multiemployer pension plans—withdrawal liability	82.8	83.5
Tax-related liabilities	18.0	30.7
Employee-related liabilities	44.6	45.0
Other	63.7	61.4
Total	$ 504.0	$ 521.5