Income Taxes (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Company's tax payments
Tax payments	$ 138.9	$ 275.1	$ 148.4
Domestic Country [Member]
Summary of Company's tax payments
Tax payments	63.0	200.0	65.0
State and Local Jurisdiction [Member]
Summary of Company's tax payments
Tax payments	11.8	13.2	0.4
Foreign Country [Member]
Summary of Company's tax payments
Tax payments	$ 64.1	$ 61.9	$ 83.0