Long-Term Debt (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Debt and capital lease obligations	$ 2,028.5		$ 1,647.0
Less: current maturities	(28.2)		(12.6)
Long-term debt, net of current maturities	2,000.3		1,634.4
7% Senior Notes Due 2014 [Member]
Senior Notes	0		14.7
6.75% Senior Notes Due 2018 [Member]
Senior Notes	395.3		395.0
5.5% Senior Notes Due 2020 [Member]
Senior Notes	350.0		0
Term Loan Facility Due 2016 [Member]
Term loan facility	500.0		500.0
Revolving Credit Facility Due 2016 [Member]
Revolving credit facility, amount outstanding	530.0		495.0
Mortgage Facility [Member]
Mortgage facility	207.5	[1]	211.5	[1]
Other Debt Due From 2012 To 2031 [Member]
Other debt due from 2011 to 2031	45.7		30.8
Other debt due maturity period range start	2012
Other debt due maturity period range end	2031
Secured Debt [Member] | Mortgage Facility [Member]
Monthly principal and interest payments on mortgage facility	1.7
Balloon payment for mortgage	$ 155.4

[1] (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.