Long-Term Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified																	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 6.75% Senior Notes Due 2018 [Member]	Dec. 31, 2012 6.75% Senior Notes Due 2018 [Member]	Jun. 30, 2013 5.5% Senior Notes Due 2020 [Member]	Dec. 31, 2012 5.5% Senior Notes Due 2020 [Member]	Jun. 30, 2013 Term Loan Facility Due 2016 [Member]	Dec. 31, 2012 Term Loan Facility Due 2016 [Member]	Jun. 30, 2013 Revolving Credit Facility Due 2016 [Member]	Dec. 31, 2012 Revolving Credit Facility Due 2016 [Member]	Jun. 30, 2013 Mortgage Facility [Member]		Dec. 31, 2012 Mortgage Facility [Member]		Jun. 30, 2013 Capital Leases and Other Debt [Member]	Dec. 31, 2012 Capital Leases and Other Debt [Member]	Jun. 30, 2013 Secured Debt [Member] Mortgage Facility [Member]
Senior Notes			$ 396.0	$ 395.6	$ 350.0	$ 350.0
Term loan facility							500.0	500.0
Revolving credit facility, amount outstanding									400.0	540.0
Mortgage facility											199.1	[1]	203.3	[1]
Capital leases and other debt															91.7	107.2
Debt and capital lease obligations	1,936.8	2,096.1
Less: current maturities	(29.6)	(29.8)
Long-term debt, net of current maturities	1,907.2	2,066.3
Monthly principal and interest payments on mortgage facility																	1.7
Balloon payment for mortgage																	$ 155.4

[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.