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Debt (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Apr. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt and Capital Leases        
Fair value of debt     $ 1,600.0 $ 1,310.0
Revolving credit facility        
Debt and Capital Leases        
Maximum borrowing capacity     $ 700.0  
Covenants compliance     we were in compliance with our financial covenants. we were in compliance with our financial covenants.
Senior notes due March 2025 at 1.25%        
Debt and Capital Leases        
Senior notes issued | € € 500.0      
Interest rate of senior notes (as a percent) 1.25%      
Proceeds, net of underwriting discounts and offering expenses € 495.6 $ 526.7    
Repayments of debt using proceeds from issuance of senior notes due March 2025 at 1.25% € 200.0 $ 215.0