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Debt - Schedule of Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings under the Credit Agreement $ 242.0 $ 216.0
Other [1] 50.2 10.8
Unamortized debt issuance costs (9.7) (11.6)
Total debt 2,177.3 2,109.7
Less: current portion (222.0) (10.8)
Long-term debt 1,955.3 2,098.9
11.25% Senior Notes Due February 1, 2019    
Debt Instrument [Line Items]    
Senior notes [2] 172.2 172.2
7.625% Senior Notes Due June 15, 2020    
Debt Instrument [Line Items]    
Senior notes 238.4 238.4
7.875% Senior Notes Due March 15, 2021    
Debt Instrument [Line Items]    
Senior notes 447.4 447.2
8.875% Debentures Due April 15, 2021    
Debt Instrument [Line Items]    
Debentures 81.0 80.9
7.00% Senior Notes Due February 15, 2022    
Debt Instrument [Line Items]    
Senior notes 140.0 140.0
6.50% Senior Notes Due November 15, 2023    
Debt Instrument [Line Items]    
Senior notes 290.6 290.6
6.00% Senior Notes Due April 1, 2024    
Debt Instrument [Line Items]    
Senior notes 298.3 298.3
6.625% Debentures Due April 15, 2029    
Debt Instrument [Line Items]    
Debentures 157.9 157.9
8.820% Debentures Due April 15, 2031    
Debt Instrument [Line Items]    
Debentures $ 69.0 $ 69.0
[1] Includes other miscellaneous debt obligations, primarily at foreign subsidiaries, and capital leases.
[2] As of September 30, 2018 and December 31, 2017, the interest rate on the 11.25% senior notes due February 1, 2019 was 13.25%, the maximum rate on these notes, as a result of previous ratings downgrades.