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Balance Sheet Accounts - Schedule of Estimated Fair Value and Principal Amount of Outstanding Debt (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Fair Value $ 709.6 $ 755.7
Principal Amount $ 685.0 725.6
Conversion of debt to common stock (in shares) 3.9  
Term loan    
Debt Instrument [Line Items]    
Fair Value $ 385.0 390.0
Principal Amount 385.0 390.0
2 1/4% Notes    
Debt Instrument [Line Items]    
Fair Value 324.6 294.9
Principal Amount 300.0 300.0
4 1/16% Debentures    
Debt Instrument [Line Items]    
Fair Value 0.0 70.8
Principal Amount $ 0.0 $ 35.6
Debentures redemption price   100.00%