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Long-Term Debt Long-term Debt Instruments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Jun. 06, 2011
Dec. 31, 2011
Line of Credit [Member]
Dec. 31, 2010
Line of Credit [Member]
Dec. 31, 2009
Line of Credit [Member]
Jun. 30, 2016
Line of Credit [Member]
Jun. 30, 2013
Line of Credit [Member]
Dec. 31, 2010
Secured Debt [Member]
Dec. 31, 2009
Secured Debt [Member]
Dec. 31, 2011
Secured Debt [Member]
Dec. 10, 2009
Secured Debt [Member]
Dec. 31, 2011
Unsecured Debt [Member]
2017 Notes [Member]
Dec. 31, 2010
Unsecured Debt [Member]
2017 Notes [Member]
Feb. 27, 2007
Unsecured Debt [Member]
2017 Notes [Member]
Dec. 31, 2011
Unsecured Debt [Member]
2019 Notes [Member]
Nov. 03, 2011
Unsecured Debt [Member]
2019 Notes [Member]
Dec. 31, 2010
Unsecured Debt [Member]
2019 Notes [Member]
Dec. 31, 2011
Unsecured Debt [Member]
2014 Notes [Member]
Dec. 31, 2010
Unsecured Debt [Member]
2014 Notes [Member]
Feb. 05, 2004
Unsecured Debt [Member]
2014 Notes [Member]
Dec. 31, 2011
Convertible Notes Payable [Member]
Dec. 31, 2010
Convertible Notes Payable [Member]
Oct. 20, 2004
Convertible Notes Payable [Member]
Dec. 31, 2011
Foreign Credit Facilities [Member]
Dec. 31, 2010
Foreign Credit Facilities [Member]
Dec. 31, 2011
Capital Lease Obligations [Member]
Dec. 31, 2010
Capital Lease Obligations [Member]
Dec. 31, 2010
Second Lien Term Loan [Member]
Debt Instrument [Line Items]                                                                
Line of Credit Facility, Maximum Borrowing Capacity                   $ 235.0 $ 86.8                                          
Line of Credit Facility, Expiration Date June 30, 2016                                                              
Payments of Debt Issuance Costs   10.9 2.2 32.9     5.9 1.6 14.5     0.3 12.6           5.0                         0.3
Line of Credit Facility, Amended Applicable Margin for LIBOR Based Loans, Lower End of Range         3.00%                                                      
Line of Credit Facility, Amended Applicable Margin for LIBOR Based Loans, Upper End of Range         4.50%                                                      
Write off of Deferred Debt Issuance Cost   1.4                                                            
Line of Credit Facility, Remaining Borrowing Capacity             293.3                                         16.0        
Line of Credit Facility, Standby Letters of Credit Issued Against the Facility   28.5                                                            
Line of Credit Facility, Increase in Aggregate Commitments   79.0                                                            
Debt Instrument, Face Amount                             425.0     300.0   200.0                        
Debt Instrument, Interest Rate, Stated Percentage                             9.25%     7.875%   7.75%       5.25%     2.00%          
2.00% Convertible Notes, Amount Converted to Cash During the Period   0.4                                                            
9.25% Senior Secured Notes, Premium Percentage Applicable to Voluntary Redemption During the Period           103.00%                                                    
9.25% Senior Secured Notes, Amount Voluntarily Redeemed During the Period           42.5                                                    
9.25% Senior Secured Notes, Amount Paid for Redemption Premium During the Period           1.3                                                    
9.25% Senior Secured Notes, Percentage Voluntarily Redeemed During the Period           10.00%                                                    
Capital Leased Assets, Gross                                                           16.1    
Capital Leases, Balance Sheet, Assets by Major Class, Net                                                           6.0 6.6  
Debt Instrument, Unamortized Discount                             5.5                                  
Interest Costs, Capitalized During Period   8.3 4.0 7.1                                                        
Long-term Debt, Weighted Average Interest Rate   8.00% 8.20% 8.30%                                                   8.80%    
Interest Payable, Current   32.0 31.1                                                          
Interest Expense   83.9 89.0 84.5                                                        
Long-term Debt   $ 1,180.2 $ 1,010.0       $ 0 $ 0       $ 420.3   $ 379.0   $ 300.0 $ 300.0   $ 200.0   $ 0 $ 249.9 $ 249.9   $ 0 $ 0.4   $ 45.2 $ 32.6 $ 6.1 $ 6.8