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Other Comprehensive Income (OCI) and Fair Value Measurements OCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]          
Assets, Fair Value Disclosure, Recurring $ 0.0   $ 0.0   $ 0.0
Liabilities, Fair Value Disclosure, Recurring 0.0   0.0   $ 0.0
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (beginning)     (80.1)    
Loss recorded in accumulated other comprehensive loss 0.0 $ 0.0 (1.5) $ 0.0  
Interest expense 41.0 48.4 131.1 136.4  
Pension and other postretirement benefit costs 0.1 0.6 0.8 2.3  
Accumulated other comprehensive income (loss) (ending) (78.9)   (78.9)    
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Interest expense 0.6 0.6 1.9 1.8  
Accumulated Net Gain (Loss) from Cash Flow Hedges          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cash Flow Hedge Loss to be Reclassified within Twelve Months     (1.5)    
Accumulated other comprehensive income (loss) (beginning) (6.2) (7.2) (6.0) (8.4)  
Accumulated other comprehensive income (loss) (ending) (5.6) (6.6) (5.6) (6.6)  
Accumulated Net Gain (Loss) from Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Interest expense 0.6 0.6 1.9 1.8  
Accumulated Defined Benefit Plans Adjustment          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (beginning) (73.4) (74.2) (74.1) (75.9)  
Pension and other postretirement benefit costs 0.1 0.6 0.8 2.3  
Accumulated other comprehensive income (loss) (ending) (73.3) (73.6) (73.3) (73.6)  
Accumulated Other Comp Income (Loss)          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income (loss) (beginning) (79.6) (81.4) (80.1) (84.3)  
Pension and other postretirement benefit costs 0.1 0.6 0.8 2.3  
Accumulated other comprehensive income (loss) (ending) $ (78.9) $ (80.2) $ (78.9) $ (80.2)