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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
1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Debt Instrument [Line Items]      
Fair Value   $ 755.7 $ 698.3
Principal Amount   725.6 680.0
Conversion of debt to common stock (in shares) 3.9    
Term loan      
Debt Instrument [Line Items]      
Fair Value   390.0 380.0
Principal Amount   390.0 380.0
2 1/4% Notes      
Debt Instrument [Line Items]      
Fair Value   294.9 318.3
Principal Amount   300.0 300.0
4 1/16% Debentures      
Debt Instrument [Line Items]      
Fair Value   70.8 0.0
Principal Amount   $ 35.6 $ 0.0
Debentures redemption price   100.00%