Debt Textuals (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended																	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2013 Term Loan	Mar. 31, 2013 Term Loan	Dec. 31, 2012 Term Loan	Mar. 31, 2013 2011 Term Loan Facility	Dec. 31, 2012 2011 Term Loan Facility	Mar. 31, 2013 7.375% Senior Notes due November 2016	Dec. 31, 2012 7.375% Senior Notes due November 2016	Mar. 31, 2013 6.00% Senior Notes due November 2018	Dec. 31, 2012 6.00% Senior Notes due November 2018	Mar. 31, 2013 6.50% Senior Notes due September 2020	Dec. 31, 2012 6.50% Senior Notes due September 2020	Mar. 31, 2013 6.25% Senior Notes due November 2021	Dec. 31, 2012 6.25% Senior Notes due November 2021	Mar. 31, 2013 7.875% Senior Notes due November 2026	Dec. 31, 2012 7.875% Senior Notes due November 2026	Mar. 31, 2013 Convertible Junior Subordinated Debentures due December 2066	Dec. 31, 2012 Convertible Junior Subordinated Debentures due December 2066	Mar. 31, 2013 Term Loan & 2011 Term Loan Facility	Jun. 30, 2013 Australian private placement bonds
Debt Instrument [Line Items]
Long-term Debt				$ 368.8	$ 418.8	$ 862.5	$ 912.5	$ 650.0	$ 650.0	$ 1,518.8	$ 1,518.8	$ 650.0	$ 650.0	$ 1,339.6	$ 1,339.6	$ 247.4	$ 247.4	$ 377.9	$ 377.4
Repayments of Long-term Debt			67.0																	100.0	32.4
Write off of Deferred Debt Issuance Cost																				0.9
Capital lease obligations	96.9	104.6
Other	33.8	33.8
Total Debt	$ 6,145.7	$ 6,252.9