Long-Term Debt And Short-Term Borrowings (Details) (USD $)	0 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended												6 Months Ended													3 Months Ended
	May 13, 2013	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013	Mar. 31, 2013	May 13, 2013 Secured Debt [Member]	May 13, 2013 Secured Debt [Member]	Jun. 30, 2013 Senior Notes [Member] Senior Unsecured Note May 2020 6 point 75	Dec. 31, 2012 Senior Notes [Member] Senior Unsecured Note May 2020 6 point 75	Jun. 30, 2013 Senior Secured Notes Restated Credit Agreement [Member]	Jun. 30, 2013 Senior Secured Notes	May 13, 2013 Senior Secured Notes	Jun. 30, 2013 Senior Secured Notes	May 13, 2013 Senior Secured Notes	Dec. 31, 2012 Senior Secured Notes	Jun. 30, 2013 Senior Secured Notes	Dec. 31, 2012 Senior Secured Notes	Jun. 30, 2013 Senior Secured Notes	Dec. 31, 2012 Senior Secured Notes	Jun. 30, 2013 Senior Secured Notes	Dec. 31, 2012 Senior Secured Notes	Jun. 30, 2013 Senior Secured Notes CAD Senior Secured Term Loan A, due May 2017	Dec. 31, 2012 Senior Secured Notes CAD Senior Secured Term Loan A, due May 2017	Jun. 30, 2013 Other Debt Obligations [Member]	Dec. 31, 2012 Other Debt Obligations [Member]	Jun. 30, 2013 Eurodollar [Member]	May 13, 2013 London Interbank Offered Rate	May 13, 2013 London Interbank Offered Rate	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding														$ 57,300,000	$ 47,300,000	$ 0
Write off of Deferred Debt Issuance Cost	9,400,000
Line of Credit Facility, Maximum Borrowing Capacity											780,000,000		250,000,000	250,000,000
Senior Secured Term Loans																	530,000,000	0	0	326,800,000	0	220,800,000	0	21,800,000
Unsecured Long-term Debt, Noncurrent									500,000,000	500,000,000
Other borrowings																									2,600,000	2,700,000
Total debt		1,089,900,000	1,089,900,000	1,072,100,000
Less: current portion		(88,500,000)	(88,500,000)	(1,300,000)
Total long-term debt		1,001,400,000	1,001,400,000	1,070,800,000
Debt Instrument, Term																	5 years
Amount Available for borrowings under Senior Secured Revolving Credit Facilities														181,800,000
Letters of credit outstanding		10,900,000	10,900,000
Debt Instrument, Interest Rate at Period End												2.54%		3.08%						4.25%		3.32%		4.26%
Debt Instrument, Interest Rate, Stated Percentage									6.75%	6.75%
Debt Instrument, Repurchased Face Amount							220,800,000	310,200,000
Debt Issuance Cost		4,400,000
Debt Issuance Costs Capitalized		4,200,000
Basis spread on variable rate																											2.25%	3.25%	3.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage					0.375%	0.50%																								0.25%	0.50%
Payments on Debt, Percentage of Aggregate Principal Amount																	5.00%
Increase in Payments of Debt, Percentage of Aggregate Principal Amount																	12.50%
Covenant Compliance, Prepayments, Percentage of Proceeds from Sale of Assets in Excess of Threshold			100.00%
Covenant Compliance, Prepayments, Proceeds from Sale of Assets Threshold Amount			10,000,000.0
Covenant Compliance, Prepayments, Percentage of Proceeds from Property Insurance Awards in Excess of Threshold			100.00%
Covenant Compliance, Prepayments, Proceeds from Property Insurance Award, Threshold Amount			$ 10,000,000
Covenant Compliance, Prepayments, Percentage of Proceeds from Additional Debt			100.00%
Covenant Compliance, Minimum Coverage Ratio			1.25