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Debt, Senior Secured Credit Facilities (Details)
€ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
Mar. 04, 2016
USD ($)
Jul. 30, 2013
USD ($)
Jul. 30, 2013
EUR (€)
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 [Line Items]            
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          
Aggregate amount of non-cash collateralized letters of credit outstanding 120.0          
Provision of non-cash collateralized letters of credit outstanding $ 50.0          
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 [Line Items]            
Consolidated senior secured debt to consolidated EBITDA ratio 5.50          
EBITDA amount $ 250.0          
Senior Secured Credit Facility [Member] | Condition Two [Member]            
Debt Instrument [Line Items]            
Consolidated senior secured debt to consolidated EBITDA ratio 4.50          
Dollar Term Loan Facility [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount $ 35.0 $ 50.0     1,900.0  
Repayment of outstanding amount $ 276.8          
Amortization and Final Maturity [Abstract]            
Percentage of original principal amount for quarterly installment payment of debt amortization 1.00%          
Accrued and unpaid interest on borrowings $ 1.5          
Write-off of unamortized debt issuance costs 4.3          
Unamortized discounts on debt included in loss on debt extinguishment $ 0.7          
Dollar Term Loan Facility [Member] | LIBOR [Member]            
Interest Rate and Fees [Abstract]            
Basis spread on variable rate 1.00% 3.25%        
Dollar Term Loan Facility [Member] | Base Rate [Member]            
Interest Rate and Fees [Abstract]            
Basis spread on variable rate   2.25%        
Term Loan Denominated in Euros Due 2020 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount | €           € 400.0
Amortization and Final Maturity [Abstract]            
Percentage of original principal amount for quarterly installment payment of debt amortization 1.00%          
Term Loan Denominated in Euros Due 2020 [Member] | LIBOR [Member]            
Interest Rate and Fees [Abstract]            
Basis spread on variable rate 1.00% 3.75%        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
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 17.0          
Unused availability $ 343.0          
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% 3.25%        
Revolving Credit Facility [Member] | Base Rate [Member]            
Interest Rate and Fees [Abstract]            
Basis spread on variable rate   2.25%        
Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
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]            
Debt Instrument [Line Items]            
Consolidated senior secured debt to consolidated EBITDA ratio 3.0          
Interest Rate and Fees [Abstract]            
Commitment fee 0.375%          
Revolving Credit Facility [Member] | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 200.0