Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		3 Months Ended			3 Months Ended			9 Months Ended								9 Months Ended							6 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Revolving Credit Facility [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Dec. 31, 2013 Secured Debt [Member] Loans Payable [Member]	Sep. 30, 2013 Secured Debt [Member] Loans Payable [Member]	Dec. 31, 2012 Secured Debt [Member] Loans Payable [Member]	Dec. 31, 2013 Secured Debt [Member] 9.25% Notes [Member]	Sep. 30, 2013 Secured Debt [Member] 9.25% Notes [Member]	Dec. 31, 2012 Secured Debt [Member] 9.25% Notes [Member]	Sep. 30, 2013 Unsecured Debt [Member] 7.875% Notes [Member]	Mar. 15, 2013 Unsecured Debt [Member] 7.875% Notes [Member]	Mar. 01, 2013 Unsecured Debt [Member] 7.875% Notes [Member]	Dec. 31, 2012 Unsecured Debt [Member] 7.875% Notes [Member]	Sep. 30, 2013 Unsecured Debt [Member] 7.75% Notes [Member]	Dec. 31, 2012 Unsecured Debt [Member] 7.75% Notes [Member]	Sep. 30, 2013 Unsecured Debt [Member] 6.625% Notes [Member]	Dec. 31, 2012 Unsecured Debt [Member] 6.625% Notes [Member]	Sep. 30, 2013 Unsecured Debt [Member] 6.25% Notes [Member]	Dec. 31, 2012 Unsecured Debt [Member] 6.25% Notes [Member]	Sep. 30, 2013 Foreign Credit Facilities [Member]	Jun. 30, 2013 Foreign Credit Facilities [Member]	Dec. 31, 2012 Foreign Credit Facilities [Member]	Sep. 30, 2013 Capital Lease Obligations [Member]	Dec. 31, 2012 Capital Lease Obligations [Member]	Jun. 30, 2013 Class C [Member] Revolving Credit Facility [Member]	Mar. 20, 2013 Class C [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 Debt Repurchase [Member] Unsecured Debt [Member] 7.875% Notes [Member]	Sep. 30, 2013 Debt Redemption [Member] Unsecured Debt [Member] 7.875% Notes [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding						$ 0	$ 0																	$ 79.3	$ 79.3	$ 61.0
Notes payable									0	0		337.9	337.5	0		300.0	300.0	200.0	200.0	550.0	550.0	400.0	0
Capital lease obligations																											5.4	5.6
Long-term debt	1,572.6		1,572.6		1,454.1
Debt instrument, interest rate, stated percentage												9.25%		7.875%				7.75%		6.625%		6.25%
Debt instrument, decrease, repayments														300.0
Payments of debt issuance costs			12.9	10.1		6.3																6.6
Debt instrument, repurchased face amount																172.6
Debt instrument, tender premium														5.2
Debt instrument, tender offer, fees														0.1
Debt refinancing and redemption costs	0	10.1	11.2	10.1																									0.5		1.2	0.9
Debt instrument, redemption amount															127.4
Debt instrument, early redemption premium											8.6			3.3
Line of credit facility, maximum borrowing capacity						523.5																		111.4
Line of credit facility, standby letters of credit issued against the facility						23.3
Increase in amended revolving facility aggregate commitments	158.5		158.5
Debt instrument, unused borrowing capacity, amount									150.0
Proceeds from issuance of debt								150.0
Repayments of long-term debt			308.6	164.3							150.0
Line of credit facility, reduction in borrowing capacity, termination of loan facility																														72.8
Amount of certain secured and local currency credit facilities available due to restrictions imposed by covenants	377.0		377.0
Payment of accrued interest, debt redemption											3.5
Debt refinancing and redemption costs			2.5	0.4							3.0
Long-term debt, weighted average interest rate	7.50%		7.50%		7.90%
Interest payable, current	$ 31.0		$ 31.0		$ 35.1