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DEBT (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
5.79%, payable through 2020
Dec. 31, 2013
5.79%, payable through 2020
Mar. 31, 2014
3.66%, payable through 2023
Dec. 31, 2013
3.66%, payable through 2023
Mar. 31, 2014
4.16%, payable through 2027
Dec. 31, 2013
4.16%, payable through 2027
Mar. 31, 2014
4.31%, payable through 2032
Dec. 31, 2013
4.31%, payable through 2032
Mar. 31, 2014
5.34% payable through 2028
Dec. 31, 2013
5.34% payable through 2028
Mar. 31, 2014
5.27% payable through 2029
Dec. 31, 2013
5.27% payable through 2029
Mar. 31, 2014
4.35%, payable through 2044
Jan. 31, 2014
Senior unsecured long-term debt
Jan. 31, 2014
Senior unsecured long-term debt
2021
Jan. 31, 2014
Senior unsecured long-term debt
2022 and 2023
Jan. 31, 2014
Senior unsecured long-term debt
2024 to 2027
Jan. 31, 2014
Senior unsecured long-term debt
2028
Jan. 31, 2014
Senior unsecured long-term debt
Starting in 2029, and thereafter until 2044
Debt                                          
Capital leases $ 2.1 $ 2.4                                      
Total debt 383.6 286.1 45.5 45.5 77.5 77.5 55.0 55.0 37.5 37.5 31.9 33.0 34.1 35.2 100.0            
Less current portion (12.5) (12.5)                                      
Total long-term debt 371.1 273.6                                      
Interest rate (as a percent)     5.79% 5.79% 3.66% 3.66% 4.16% 4.16% 4.31% 4.31% 5.34% 5.34% 5.27% 5.27% 4.35% 4.35%          
Debt issued                               100          
Debt instrument term                               30 years          
Weighted average period                             14 years 6 months            
Annual principal payments                                 $ 5.0 $ 7.5 $ 10.0 $ 8.0 $ 2.0