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Partners' Capital Schedule of CMLP Partnership Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Nov. 13, 2015
Nov. 06, 2015
Aug. 14, 2015
Aug. 07, 2015
May. 15, 2015
May. 08, 2015
Feb. 13, 2015
Feb. 06, 2015
Nov. 14, 2014
Nov. 07, 2014
Aug. 14, 2014
Aug. 07, 2014
Aug. 07, 2014
May. 15, 2014
May. 08, 2014
Feb. 14, 2014
Feb. 07, 2014
Nov. 14, 2013
Nov. 07, 2013
Aug. 14, 2013
Aug. 09, 2013
Aug. 07, 2013
Aug. 01, 2013
May. 10, 2013
Apr. 30, 2013
Feb. 12, 2013
Jan. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Distribution Made to Limited Liability Company (LLC) Member [Line Items]                                                            
Distribution to limited partner, record date   Nov. 06, 2015   Aug. 07, 2015   May 08, 2015   Feb. 06, 2015   Nov. 07, 2014   Aug. 07, 2014     May 08, 2014   Feb. 07, 2014   Nov. 07, 2013     Aug. 07, 2013                
Distribution to limited partner, distribution date Nov. 13, 2015   Aug. 14, 2015   May 15, 2015   Feb. 13, 2015   Nov. 14, 2014   Aug. 14, 2014     May 15, 2014   Feb. 14, 2014   Nov. 14, 2013   Aug. 14, 2013                    
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 1.3750   $ 1.3750   $ 1.3750   $ 1.3750   $ 1.3750   $ 1.3750     $ 1.3750   $ 1.3750   $ 1.35   $ 1.30                    
Distribution Made to Limited Partner, Cash Distributions Paid $ 94.3   $ 25.7   $ 25.7   $ 25.8   $ 25.6   $ 25.6     $ 25.7   $ 25.6   $ 25.0   $ 22.3               $ 171.5 $ 102.5 $ 47.3
CMLP                                                            
Distribution Made to Limited Liability Company (LLC) Member [Line Items]                                                            
Distribution to limited partner, record date       Aug. 07, 2015   May 08, 2015   Feb. 06, 2015   Nov. 07, 2014     Aug. 07, 2014   May 08, 2014   Feb. 07, 2014   Nov. 07, 2013     Aug. 07, 2013 Aug. 01, 2013   Apr. 30, 2013   Jan. 31, 2013      
Distribution to limited partner, distribution date     Aug. 14, 2015   May 15, 2015   Feb. 13, 2015   Nov. 14, 2014   Aug. 14, 2014     May 15, 2014   Feb. 14, 2014   Nov. 14, 2013   Aug. 14, 2013 Aug. 09, 2013     May 10, 2013   Feb. 12, 2013        
Distribution Made to Limited Partner, Distributions Paid, Per Unit     $ 0.41   $ 0.41   $ 0.41   $ 0.41   $ 0.41     $ 0.41   $ 0.41   $ 0.405   $ 0.400 $ 0.510     $ 0.510   $ 0.510        
Distribution Made to Limited Partner, Cash Distributions Paid     $ 74.3   $ 74.3   $ 74.3   $ 74.1   $ 74.1     $ 74.2   $ 74.1   $ 69.5   $ 34.3 $ 27.4     $ 27.4   $ 21.0   $ 222.9 $ 296.5 $ 179.6