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Debt, Senior Secured Credit Facilities (Details)
€ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Aug. 17, 2017
USD ($)
Jun. 30, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2014
Dec. 31, 2017
USD ($)
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     $ 110.5 $ 859.4            
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              
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              
Other non-cash collateralized letters of credit maximum amount under restrictive covenant     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              
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     $ 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              
Accrued and unpaid interest     16.5              
Write-off of unamortized debt issuance costs     $ 0.2              
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     7.0              
Unused availability     $ 353.0              
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              
Certain Covenants and Events of Default [Abstract]                    
Aggregate amount of non-cash collateralized letters of credit outstanding     $ 300.0              
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