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Debt, Senior Secured Credit Facilities (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 17, 2017
USD ($)
Jun. 30, 2017
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2014
Jul. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 17, 2017
EUR (€)
Mar. 04, 2016
USD ($)
Jul. 30, 2013
USD ($)
Jul. 30, 2013
EUR (€)
Amortization and Final Maturity [Abstract]                          
Principal payment of outstanding borrowings         $ 262.4 $ 2,872.2              
LIBOR [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate         1.00%                
Term of variable rate         1 month                
Federal Funds Effective Rate [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate         0.50%                
Senior Secured Credit Facility [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Aggregate principal amount                       $ 2,825.0  
Prepayments [Abstract]                          
Percentage of annual excess cash flow for prepayment of outstanding loan             50.00%            
Percentage of annual excess cash flow for prepayment of outstanding loan under restrictive covenants         25.00%                
Percentage of the net cash proceeds of all non-ordinary course asset sales for prepayment of outstanding term loan         100.00%                
Percentage of net cash proceeds of any incurrence of debt for prepayment of outstanding term loan         100.00%                
Certain Covenants and Events of Default [Abstract]                          
Consolidated Total Debt to Consolidated EBITDA ratio         5.00                
Investments in unrestricted subsidiaries     $ 100.0   $ 100.0                
Percentage of consolidated EBITDA         25.00%                
Senior Secured Credit Facility [Member] | Maximum [Member]                          
Prepayments [Abstract]                          
Consolidated secured debt to consolidated EBITDA ratio considered for prepayment of outstanding term loan under covenant one         3.50                
Certain Covenants and Events of Default [Abstract]                          
Letters of credit under restrictive covenant     80.0   $ 80.0                
Other non-cash collateralized letters of credit maximum amount under restrictive covenant     25.0   25.0                
Provision of non-cash collateralized letters of credit outstanding         50.0                
Aggregate amount of non-cash collateralized letters of credit outstanding     120.0   $ 120.0                
Senior Secured Credit Facility [Member] | Minimum [Member]                          
Prepayments [Abstract]                          
Consolidated secured debt to consolidated EBITDA ratio considered for prepayment of outstanding term loan under covenant two         3.00                
Senior Secured Credit Facility [Member] | Condition One [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
EBITDA amount         $ 250.0                
Consolidated senior secured debt to consolidated EBITDA ratio         5.50                
Senior Secured Credit Facility [Member] | Condition Two [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Consolidated senior secured debt to consolidated EBITDA ratio         4.50                
Original Dollar Term Loan Facility [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Aggregate principal amount     35.0   $ 35.0       $ 50.0     1,900.0  
Maximum borrowing capacity $ 1,285.5                        
Amortization and Final Maturity [Abstract]                          
Percentage of original principal amount for quarterly installment payment of debt amortization         1.00%                
Principal payment of outstanding borrowings       $ 100.0 $ 150.0                
Write-off of unamortized debt issuance costs     0.3   $ 0.4                
Original Dollar Term Loan Facility [Member] | LIBOR [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate 0.00% 1.00%     2.75%                
Original Dollar Term Loan Facility [Member] | Base Rate [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate         1.75%                
Euro Term Loan Due in 2020 [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Aggregate principal amount | €                         € 400.0
Maximum borrowing capacity | €                   € 615.0      
Amortization and Final Maturity [Abstract]                          
Percentage of original principal amount for quarterly installment payment of debt amortization         1.00%                
Euro Term Loan Due in 2020 [Member] | LIBOR [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate 0.00% 1.00%     3.00%                
Revolving Credit Facility [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Maximum borrowing capacity                     $ 360.0 $ 400.0  
Decrease in borrowing capacity                     $ 40.0    
Expected decrease in borrowing capacity next year               $ 269.9          
Letters of credit outstanding     6.3   $ 6.3                
Unused availability     263.6   $ 263.6                
Consolidated senior secured debt to consolidated EBITDA ratio         7.00                
Interest Rate and Fees [Abstract]                          
Commitment fee         0.50%                
Revolving Credit Facility [Member] | LIBOR [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate 0.00%       2.75%                
Revolving Credit Facility [Member] | Base Rate [Member]                          
Interest Rate and Fees [Abstract]                          
Basis spread on variable rate         1.75%                
Revolving Credit Facility [Member] | Maximum [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Consolidated senior secured debt to consolidated EBITDA ratio         7.50                
Revolving Credit Facility [Member] | Condition Three [Member]                          
Interest Rate and Fees [Abstract]                          
Commitment fee         0.375%                
Revolving Credit Facility [Member] | Condition Three [Member] | Maximum [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Consolidated senior secured debt to consolidated EBITDA ratio         3.0                
Revolving Credit Facility [Member] | Letter of Credit [Member]                          
Debt Instrument, Senior Secured Credit Facilities [Abstract]                          
Maximum borrowing capacity     $ 200.0   $ 200.0