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Debt (Narrative - 5.875% Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Mar. 28, 2018
Oct. 27, 2016
Debt Instrument [Line Items]      
Basis spread on treasury rate 0.50%    
5.875% Senior Notes      
Debt Instrument [Line Items]      
Net income, amount free of restrictions $ (11.4)    
Retained earnings, amount free of restrictions $ 506.2    
5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Coupon rate 5.875%    
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed 1.00%    
2016 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Principal amount issued     $ 520.0
2018 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Principal amount issued   $ 512.3  
Prior to November 1, 2019 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
On or after November 1, 2019 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 104.406%    
On or after November 1, 2020 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 102.938%    
On or after November 1, 2021 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.439%    
On or after November 1, 2022 | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%    
Change in Control | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 101.00%    
Certain Asset Disposition | 5.875% Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Debt instrument redemption price percentage 100.00%