Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Long-Term Liabilities
Deferred taxes and other tax liabilities	$ 253.8	$ 179.4
Pension and other post-retirement obligations	19.1	18.3
Deferred credits	9.1	3.0
Deferred compensation	5.5	3.2
Other	2.8	0.8
Other long-term liabilities	$ 290.3	$ 204.7