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Debt - Convertible Senior Notes (Details)
$ / shares in Units, shares in Millions, $ in Millions
Mar. 06, 2017
USD ($)
D
$ / shares
shares
1.375% Convertible Senior Notes  
Debt  
Principal amount | $ $ 400.0
Semi-annual interest rate 1.375%
Conversion rate, shares per $1,000 principal 10.7744
Number of shares of common stock | shares 4.3
Initial conversion price | $ / shares $ 92.81
Debt issuance costs | $ $ 10.6
1.375% Convertible Senior Notes | Conversion of Notes, Holders  
Debt  
Number of trading days within 30 trading day period 20
Number of consecutive trading days 30
Minimum amount the sales price of the Company's stock exceeds the conversion price (as a percent) 130.00%
Number of consecutive business days after the 10 consecutive trading day period 5 days
Number of consecutive trading days before the five consecutive business days 10 days
Maximum amount the sales price of the Company's stock exceeds the conversion price (as a percent) 98.00%
1.375% Convertible Senior Notes | Conversion of Notes, Company  
Debt  
Number of trading days within 30 trading day period 20
Number of consecutive trading days 30
Minimum amount the sales price of the Company's stock exceeds the conversion price (as a percent) 130.00%
Amended Credit Agreement | Credit Facility  
Debt  
Repayments of Lines of Credit | $ $ 72.5