Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified																	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 7% Senior Notes Due 2014 [Member]	Dec. 31, 2011 7% Senior Notes Due 2014 [Member]	Dec. 31, 2012 6.75% Senior Notes Due 2018 [Member]	Dec. 31, 2011 6.75% Senior Notes Due 2018 [Member]	Dec. 31, 2012 5.5% Senior Notes Due 2020 [Member]	Dec. 31, 2011 5.5% Senior Notes Due 2020 [Member]	Dec. 31, 2012 Term loan facility due 2016 [Member]	Dec. 31, 2011 Term loan facility due 2016 [Member]	Dec. 31, 2012 Revolving credit facility due 2016 [Member]	Dec. 31, 2011 Revolving credit facility due 2016 [Member]	Dec. 31, 2012 Mortgage Facility [Member]		Dec. 31, 2011 Mortgage Facility [Member]		Dec. 31, 2012 Mortgage Facility [Member] Secured Debt [Member]	Dec. 31, 2012 Capital Leases [Member]	Dec. 31, 2011 Capital Leases [Member]
Debt Instruments [Abstract]
Senior Notes			$ 0	$ 14.7	$ 395.6	$ 395.0	$ 350.0	$ 0
Term loan facility									500.0	500.0
Revolving credit facility											540.0	495.0
Mortgage facility													203.3	[1]	211.5	[1]
Capital leases and other debt																		107.2	30.8
Debt and capital lease obligations	2,096.1	1,647.0
Less: current maturities	(29.8)	(12.6)
Long-term debt, net of current maturities	2,066.3	1,634.4
Monthly principal and interest payments on mortgage facility																	1.7
Balloon payment for mortgage																	$ 155.4
Debt instrument, maturity date																	Nov. 30, 2017

[1] The mortgage facility requires monthly principal and interest payments of $1.7 million based on a fixed amortization schedule with a balloon payment of $155.4 million due November 2017.