XML 52 R41.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 775.0   $ 1,025.0
Letters of Credit Outstanding, Amount 11.9   $ 18.2
Borrowing capacity remaining 94.8    
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0    
Average outstanding borrowings $ 1,117.5 $ 554.3  
Pricing on the Facility based on market rates LIBOR plus 0.95% to 2.05%    
Description of Variable Rate Basis LIBOR    
Basis spread on variable rate (in hundredths) 1.05%    
Line of credit, interest rate during period 1.70% 1.40%  
Covenant terms, minimum cash interest coverage ratio 300.00%    
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Covenant terms, minimum leverage ratio through specified date 350.00%    
Covenant Terms Minimum Leverage Ratio Through Specified Date Following a Material Acquisition 400.00%