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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 229.6 $ 149.8
Derivative financial instruments: Assets 0.0 0.0
Derivative financial instruments: Liabilities 0.0 0.0
Debt 1,868.4 964.5
Fair Value Measurements at Reporting Date Using Significant Observable Inputs (Level 2)    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 0.0 0.0
Derivative financial instruments: Assets 9.1 2.4
Derivative financial instruments: Liabilities 18.7 71.3
Debt 106.6 5.2
Total Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 229.6 149.8
Derivative financial instruments: Assets 9.1 2.4
Derivative financial instruments: Liabilities 18.7 71.3
Debt 1,894.1 1,505.2
Fair Value Measurements at Reporting Date Using Total Estimated Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 229.6 149.8
Derivative financial instruments: Assets 9.1 2.4
Derivative financial instruments: Liabilities 18.7 71.3
Debt $ 1,975.0 $ 969.7