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Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments    
Preferred stock $ 30.4 $ 30.4
Total capital lease obligation 27.0 29.6
Carrying amount    
Financial Instruments    
Preferred stock 30.4 30.4
Long-term debt, including current portion 9,561.7 9,285.8
Total capital lease obligation 27.0 29.6
Fair value    
Financial Instruments    
Preferred stock 30.5 28.8
Long-term debt, including current portion $ 10,341.9 $ 9,818.2