Financial Instruments and Fair Value Measurements - Schedule of Long-term Debt Carrying Value and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
5.00% Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	5.00%
Carrying Value
Debt Instrument [Line Items]
Debt, fair value	$ 586.1	$ 587.1
Carrying Value | 5.00% Senior Notes
Debt Instrument [Line Items]
Debt, fair value	546.8	546.4
Carrying Value | Real estate related
Debt Instrument [Line Items]
Debt, fair value	39.3	40.7
Fair Value
Debt Instrument [Line Items]
Debt, fair value	549.3	600.6
Fair Value | 5.00% Senior Notes
Debt Instrument [Line Items]
Debt, fair value	510.4	559.5
Fair Value | Real estate related
Debt Instrument [Line Items]
Debt, fair value	$ 38.9	$ 41.1