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Retirement and Deferred Compensation Plans - Changes in Fair Value of Pension Assets Measured Using Level 3 Inputs (Details) - Common contractual funds and insurance contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change in Plan Assets    
Fair value of plan assets, beginning of year $ 126.2 $ 92.0
Transfers (25.4) 27.3
Actual return on plan assets (5.3) 13.9
Purchases, sales and settlements, net (0.6) (2.1)
Currency exchange rate changes 13.9 (4.9)
Fair value of plan assets, end of year $ 108.8 $ 126.2