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Debt (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]              
Loss (gain) on debt extinguishment       $ (2.6) $ 279.0    
Amortization of debt discount (premium)       (8.7) $ (16.2)    
Maturities in 2019 $ 237.6     237.6      
Maturities in 2020 450.9     450.9      
Maturities 2021 $ 269.7     $ 269.7      
Quarterly cash dividends (in dollars per share) $ 0.01   $ 0.01 $ 0.03 $ 0.03    
8.50% Senior notes due 2019              
Debt Instrument [Line Items]              
Debt instrument interest rate stated percentage 8.50%     8.50%     8.50%
6.875% Senior notes due 2020              
Debt Instrument [Line Items]              
Debt instrument interest rate stated percentage 6.875%     6.875%     6.875%
4.70% Senior notes due 2021              
Debt Instrument [Line Items]              
Debt instrument interest rate stated percentage 4.70%     4.70%     4.70%
8.00% Senior notes due 2024              
Debt Instrument [Line Items]              
Debt instrument interest rate stated percentage 8.00%     8.00%      
Senior Notes              
Debt Instrument [Line Items]              
Loss (gain) on debt extinguishment   $ 6.2          
Revolving Credit Facility [Member] | Credit Facility due 2022              
Debt Instrument [Line Items]              
Current borrowing capacity $ 1,200.0     $ 1,200.0      
Period for repayment of acquired companies       90 days      
Aggregate amount of available cash, after repayments 250.0     $ 250.0      
Revolving Credit Facility [Member] | Five Year Credit Facility              
Debt Instrument [Line Items]              
Current borrowing capacity 2,000.0     2,000.0   $ 2,250.0  
Maximum borrowing capacity 1,500.0     $ 1,500.0      
Commitment fee percentage       0.625%      
Maximum percent of debt to total capitalization ratio       60.00%      
Additional secured debt, value       $ 750.0      
Additional secured debt, percent of tangible net worth       10.00%      
Quarterly cash dividends (in dollars per share)       $ 0.01      
Aggregate amount of available cash 150.0     $ 150.0      
Fair value of amount outstanding 0.0     $ 0.0      
Revolving Credit Facility [Member] | Credit Facility due 2020              
Debt Instrument [Line Items]              
Current borrowing capacity           $ 1,130.0  
Revolving Credit Facility [Member] | Base Rate | Five Year Credit Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate       2.50%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) | Five Year Credit Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate       3.50%      
Senior Notes              
Debt Instrument [Line Items]              
Amortization of debt discount (premium)   3.5          
Amortization of debt issuance costs   2.7          
Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Aggregate Principal Amount Repurchased 194.1 649.5   $ 194.1      
Senior Notes | Senior Notes | 8.50% Senior notes due 2019              
Debt Instrument [Line Items]              
Aggregate Principal Amount Repurchased 54.6 145.8   54.6      
Senior Notes | Senior Notes | 6.875% Senior notes due 2020              
Debt Instrument [Line Items]              
Aggregate Principal Amount Repurchased 100.1 129.8   100.1      
Senior Notes | Senior Notes | 4.70% Senior notes due 2021              
Debt Instrument [Line Items]              
Aggregate Principal Amount Repurchased $ 39.4 $ 373.9   $ 39.4