v3.5.0.2
Changes in Accumulated Other Comprehensive Loss (Income) by Component - Summary of Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive (Income) Loss [Roll Forward]        
Beginning balance     $ 30.5  
Other comprehensive loss before reclassifications     14.1  
Amounts reclassified from accumulated other comprehensive income     (21.6)  
Net current period other comprehensive (income) $ (7.9) $ 4.9 (7.5) $ (2.3)
Ending balance 23.0   23.0  
Cash Flow Hedges        
Accumulated Other Comprehensive (Income) Loss [Roll Forward]        
Beginning balance     41.6  
Other comprehensive loss before reclassifications     14.1  
Amounts reclassified from accumulated other comprehensive income     (21.6)  
Net current period other comprehensive (income)     (7.5)  
Ending balance 34.1   34.1  
Defined Benefit Pension Items        
Accumulated Other Comprehensive (Income) Loss [Roll Forward]        
Beginning balance     (11.1)  
Other comprehensive loss before reclassifications     0.0  
Amounts reclassified from accumulated other comprehensive income     0.0  
Net current period other comprehensive (income)     0.0  
Ending balance $ (11.1)   $ (11.1)